Method and device for transmitting control information in wireless communication system

ABSTRACT

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for reporting CSI in a wireless communication system, the method comprising: a step for configuring a plurality of serving cells; and a step for reporting the CSI of only one serving cell in a corresponding subframe, wherein the step for reporting the CSI of only one serving cell comprises: excluding reporting the CSI of a lower priority when CSI reports of the plurality of serving cells in the corresponding subframe collide; and excluding reporting the CSI of serving cells other than the serving cell having the smallest index when the CSI reports of different serving cells having the same priority in the corresponding subframe collide.

TECHNICAL FIELD

The present invention relates to a wireless communication system, andmore particularly to a method and apparatus for transmitting controlinformation in a wireless communication system supporting carrieraggregation (CA).

BACKGROUND ART

Wireless communication systems have been widely used to provide variouskinds of communication services such as voice or data services.Generally, a wireless communication system is a multiple access systemthat can communicate with multiple users by sharing available systemresources (bandwidth, transmission (Tx) power, and the like). A varietyof multiple access systems can be used. For example, a Code DivisionMultiple Access (CDMA) system, a Frequency Division Multiple Access(FDMA) system, a Time Division Multiple Access (TDMA) system, anOrthogonal Frequency Division Multiple Access (OFDMA) system, a SingleCarrier Frequency-Division Multiple Access (SC-FDMA) system, and thelike.

DISCLOSURE Technical Problem

Accordingly, the present invention is directed to a method and apparatusfor efficiently transmitting control information in a wirelesscommunication system that substantially obviate one or more problems dueto limitations and disadvantages of the related art. An object of thepresent invention is to provide a method and apparatus for efficientlytransmitting control information in a wireless communication system.Another object of the present invention is to provide a channel formatand signal processing for effectively transmitting control information,and an apparatus for the channel format and the signal processing. Afurther object of the present invention is to provide a method andapparatus for effectively allocating resources for transmitting controlinformation.

It will be appreciated by persons skilled in the art that the objectsthat can be achieved through the present invention are not limited towhat has been particularly described hereinabove and the above and otherobjects that the present invention can achieve will be more clearlyunderstood from the following detailed description taken in conjunctionwith the accompanying drawings.

Technical Solution

The object of the present invention can be achieved by providing amethod for performing a channel state information (CSI) report in awireless communication system, the method comprising: configuring aplurality of serving cells; and performing a CSI report of only a singleserving cell in a corresponding subframe, wherein the performing of theCSI report of only the single serving cell includes: if CSI reports of aplurality of serving cells collide with each other in the correspondingsubframe, dropping one or more CSI reports having lower priorities, andif CSI reports of different serving cells having a same priority collidewith each other in the corresponding subframe, dropping CSI reports ofone or more serving cells other than one serving cell having the lowestindex.

In another aspect of the present invention, a communication device forperforming a channel state information (CSI) report in a wirelesscommunication system includes: a radio frequency (RF) unit; and aprocessor, wherein the processor configures a plurality of servingcells, and performs a CSI report of only a single serving cell in acorresponding subframe, wherein the performing of the CSI report of onlythe single serving cell includes: if CSI reports of a plurality ofserving cells collide with each other in the corresponding subframe,dropping one or more CSI reports having lower priorities, and if CSIreports of different serving cells having a same priority collide witheach other in the corresponding subframe, dropping CSI reports of one ormore serving cells other than one serving cell having the lowest index.

The method may further include: if CSI reports of different servingcells having the same priority collide with each other in thecorresponding subframe, transmitting a CSI report of the serving cellhaving the lowest index.

The priority of the CSI report may be determined according to a physicaluplink control channel (PUCCH) report type.

The CSI report may include at least one of a channel quality indicator(CQI), a precoding matrix indicator (PMI) and a Rank indicator (RI), anda first period and a first offset for the CQI/PMI, and a second periodand a second offset for the RI may be given per serving cell.

The plurality of serving cells may include a primary cell (PCell) and asecondary cell (SCell).

The CSI report may be transmitted using a PUCCH format 1b.

Advantageous Effects

Exemplary embodiments of the present invention have the followingeffects. Control information can be effectively transmitted in awireless system. In addition, the embodiments of the present inventioncan provide a channel format and a signal processing method toeffectively transmit control information. In addition, resources fortransmitting control information can be effectively assigned.

It will be appreciated by persons skilled in the art that the effectsthat can be achieved through the present invention are not limited towhat has been particularly described hereinabove and other advantages ofthe present invention will be more clearly understood from the followingdetailed description taken in conjunction with the accompanyingdrawings.

DESCRIPTION OF DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention, illustrate embodiments of the inventionand together with the description serve to explain the principle of theinvention.

FIG. 1 is a conceptual diagram illustrating physical channels used in a3GPP LTE system acting as an exemplary mobile communication system and ageneral method for transmitting a signal using the physical channels.

FIG. 2A is a diagram illustrating a structure of a radio frame.

FIG. 2B is a diagram illustrating a structure of a radio frame.

FIG. 3A is a conceptual diagram illustrating a method for processing anuplink signal.

FIG. 3B is a conceptual diagram illustrating a method for processing adownlink signal.

FIG. 4 is a conceptual diagram illustrating an SC-FDMA scheme and anOFDMA scheme applicable to embodiments of the present invention.

FIG. 5A is a conceptual diagram illustrating a signal mapping scheme ina frequency domain so as to satisfy single carrier characteristics.

FIG. 5B is a conceptual diagram illustrating a signal mapping scheme ina frequency domain so as to satisfy single carrier characteristics.

FIG. 6 is a conceptual diagram illustrating the signal processing formapping DFT process output samples to a single carrier in a clusteredSC-FDMA.

FIGS. 7 and 8 show the signal processing in which DFT process outputsamples are mapped to multiple carriers in a clustered SC-FDMA.

FIG. 9 shows exemplary segmented SC-FDMA signal processing.

FIG. 10 shows an uplink subframe structure.

FIG. 11 is a conceptual diagram illustrating a signal processingprocedure for transmitting a reference signal (RS) on uplink.

FIG. 12A shows demodulation reference signal (DMRS) structures for aphysical uplink shared channel (PUSCH).

FIG. 12B shows demodulation reference signal (DMRS) structures for aphysical uplink shared channel (PUSCH).

FIGS. 13 and 14 exemplarily show slot level structures of PUCCH formats1a and 1b.

FIGS. 15 and 16 exemplarily show slot level structures of PUCCH formats2/2a/2b.

FIG. 17 is a diagram showing ACK/NACK channelization of PUCCH formats 1aand 1b.

FIG. 18 is a diagram showing channelization of a structure in whichPUCCH formats 1/1a/1b and PUCCH formats 2/2a/2b are mixed within thesame PRB.

FIG. 19 is a diagram showing allocation of a physical resourceallocation (PRB) used to transmit a PUCCH.

FIG. 20 is a conceptual diagram of management of a downlink componentcarrier (DL CC) in a base station (BS).

FIG. 21 is a conceptual diagram of management of an uplink componentcarrier (UL CC) in a user equipment (UE).

FIG. 22 is a conceptual diagram of the case where one MAC layer managesmultiple carriers in a BS.

FIG. 23 is a conceptual diagram of the case where one MAC layer managesmultiple carriers in a UE.

FIG. 24 is a conceptual diagram of the case where one MAC layer managesmultiple carriers in a BS.

FIG. 25 is a conceptual diagram of the case where a plurality of MAClayers manages multiple carriers in a UE.

FIG. 26 is a conceptual diagram of the case where a plurality of MAClayers manages multiple carriers in a BS according to one embodiment ofthe present invention.

FIG. 27 is a conceptual diagram of the case where a plurality of MAClayers manages multiple carriers from the viewpoint of UE receptionaccording to another embodiment of the present invention.

FIG. 28 is a diagram showing asymmetric carrier aggregation (CA) inwhich a plurality of downlink component carriers (DL CCs) and one uplinkCC are linked.

FIGS. 29A to 29F are conceptual diagrams illustrating a DFT-S-OFDMAformat structure and associated signal processing according to theembodiments of the present invention.

FIGS. 30 to 32 are conceptual diagrams illustrating a periodic channelstate information (CSI) report procedure of the legacy LTE.

FIG. 33 is a flowchart illustrating a method for performing CSI reportaccording to the embodiments of the present invention.

FIG. 34 is a block diagram illustrating a base station (BS) and a userequipment (UE) applicable to embodiments of the present invention.

BEST MODE

Reference will now be made in detail to the preferred embodiments of thepresent invention with reference to the accompanying drawings. Thedetailed description, which will be given below with reference to theaccompanying drawings, is intended to explain exemplary embodiments ofthe present invention, rather than to show the only embodiments that canbe implemented according to the invention. The following embodiments ofthe present invention can be applied to a variety of wireless accesstechnologies, for example, CDMA, FDMA, TDMA, OFDMA, SC-FDMA, MC-FDMA,and the like. CDMA can be implemented by wireless communicationtechnologies, such as Universal Terrestrial Radio Access (UTRA) orCDMA2000. TDMA can be implemented by wireless communicationtechnologies, for example, Global System for Mobile communications(GSM), General Packet Radio Service (GPRS), Enhanced Data rates for GSMEvolution (EDGE), etc. OFDMA can be implemented by wirelesscommunication technologies, for example, IEEE 802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE 802.20, E-UTRA (Evolved UTRA), and the like. UTRAis a part of the Universal Mobile Telecommunications System (UMTS). 3rdGeneration Partnership Project (3GPP) Long Term Evolution (LTE) is apart of Evolved UMTS (E-UMTS) that uses E-UTRA. The LTE Advanced (LTE-A)is an evolved version of 3GPP LTE. Although the following embodiments ofthe present invention will hereinafter describe inventive technicalcharacteristics on the basis of the 3GPP LTE/LTE-A system, it should benoted that the following embodiments will be disclosed only forillustrative purposes and the scope and spirit of the present inventionare not limited thereto.

In a wireless communication system, the UE may receive information fromthe base station (BS) via a downlink, and may transmit information viaan uplink. The information that is transmitted and received to and fromthe UE includes data and a variety of control information. A variety ofphysical channels are used according to categories of transmission (Tx)and reception (Rx) information of the UE.

FIG. 1 is a conceptual diagram illustrating physical channels for use ina 3GPP system and a general method for transmitting a signal using thephysical channels.

Referring to FIG. 1, when powered on or when entering a new cell, a UEperforms initial cell search in step S101. The initial cell searchinvolves synchronization with a BS. Specifically, the UE synchronizeswith the BS and acquires a cell Identifier (ID) and other information byreceiving a Primary Synchronization CHannel (P-SCH) and a SecondarySynchronization CHannel (S-SCH) from the BS. Then the UE may acquireinformation broadcast in the cell by receiving a Physical BroadcastCHannel (PBCH) from the BS. During the initial cell search, the UE maymonitor a downlink channel status by receiving a downlink ReferenceSignal (DL RS).

After initial cell search, the UE may acquire more specific systeminformation by receiving a Physical Downlink Control CHannel (PDCCH) andreceiving a Physical Downlink Shared CHannel (PDSCH) based oninformation of the PDCCH in step S102.

Thereafter, if the UE initially accesses the BS, it may perform randomaccess to the BS in steps S103 to S106. For random access, the UE maytransmit a preamble to the BS on a Physical Random Access CHannel(PRACH) in step S103 and receive a response message for the randomaccess on a PDCCH and a PDSCH corresponding to the PDCCH in step S104.In the case of contention-based random access, the UE may transmit anadditional PRACH in step S105, and receive a PDCCH and a PDSCHcorresponding to the PDCCH in step S106 in such a manner that the UE canperform a contention resolution procedure.

After the above random access procedure, the UE may receive aPDCCH/PDSCH (S107) and transmit a Physical Uplink Shared CHannel(PUSCH)/Physical Uplink Control CHannel (PUCCH) (S108) in a generaluplink/downlink signal transmission procedure. Control information thatthe UE transmits to the BS is referred to as uplink control information(UCI). The UCI includes a Hybrid Automatic Repeat and reQuestACKnowledgment/Negative-ACK (HARQ ACK/NACK) signal, a Scheduling Request(SR), Channel Quality Indictor (CQI), a Precoding Matrix Index (PMI),and a Rank Indicator (RI). The UCI is transmitted on a PUCCH, ingeneral. However, the UCI can be transmitted on a PUSCH when controlinformation and traffic data need to be transmitted simultaneously.Furthermore, the UCI can be aperiodically transmitted on a PUSCH at therequest/instruction of a network.

FIG. 2 illustrates a radio frame structure. In a cellular OFDM wirelesspacket communication system, UL/DL data packet transmission is performedbased on subframe. One subframe is defined as a predetermined intervalincluding a plurality of OFDM symbols. 3GPP LTE supports a type-1 radioframe applicable to Frequency Division Duplex (FDD) and type-2 radioframe applicable to Time Division Duplex (TDD).

FIG. 2(a) illustrates a type-1 radio frame structure. A DL radio frameincludes 10 subframes each having 2 slots in the time domain. A timerequired to transmit one subframe is referred to as Transmission TimeInterval (TTI). For example, one subframe is 1 ms long and one slot is0.5 ms long. One slot includes a plurality of OFDM symbols in the timedomain and a plurality of Resource Blocks (RBs) in the frequency domain.Since 3GPP LTE systems use OFDMA in downlink, an OFDM symbol representsone symbol interval. The OFDM symbol can be called an SC-FDMA symbol orsymbol interval. An RB as a resource allocation unit may include aplurality of consecutive subcarriers in one slot.

The number of OFDM symbols included in one slot may depend on CyclicPrefix (CP) configuration. CPs include an extended CP and a normal CP.When an OFDM symbol is configured with the normal CP, for example, thenumber of OFDM symbols included in one slot may be 7. When an OFDMsymbol is configured with the extended CP, the length of one OFDM symbolincreases, and thus the number of OFDM symbols included in one slot issmaller than that in case of the normal CP. In case of the extended CP,the number of OFDM symbols allocated to one slot may be 6. When channelstate is unstable, such as a case in which a UE moves at a high speed,the extended CP can be used to reduce inter-symbol interference.

When the normal CP is used, one subframe includes 14 OFDM symbols sinceone slot has 7 OFDM symbols. The first three OFDM symbols at most ineach subframe can be allocated to a PDCCH and the remaining OFDM symbolscan be allocated to a PDSCH.

FIG. 2(b) illustrates a type-2 radio frame structure. The type-2 radioframe includes 2 half frames. Each half frame includes 5 subframes, aDownlink Pilot Time Slot (DwPTS), a Guard Period (GP), and an UplinkPilot Time Slot (UpPTS), and one subframe consists of 2 slots. The DwPTSis used for initial cell search, synchronization or channel estimation.The UpPTS is used for channel estimation in a BS and UL transmissionsynchronization acquisition in a UE. The GP eliminates UL interferencecaused by multi-path delay of a DL signal between a UL and a DL.

The aforementioned structure of the radio frame is only exemplary, andvarious modifications can be made to the number of subframes containedin the radio frame or the number of slots contained in each subframe, orthe number of OFDM symbols in each slot.

FIG. 3A is a conceptual diagram illustrating a signal processing methodfor transmitting an uplink signal by a user equipment (UE).

Referring to FIG. 3A, the scrambling module 201 may scramble atransmission signal in order to transmit the uplink signal. Thescrambled signal is input to the modulation mapper 202, such that themodulation mapper 202 modulates the scrambled signal to complex symbolsin Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying(QPSK), or 16-ary Quadrature Amplitude Modulation (16QAM) according tothe type of the transmission signal and/or a channel status. A transformprecoder 203 processes the complex symbols and a resource element mapper204 may map the processed complex symbols to time-frequency resourceelements, for actual transmission. The mapped signal may be transmittedto the BS through an antenna after being processed in a SingleCarrier-Frequency Division Multiple Access (SC-FDMA) signal generator205.

FIG. 3B is a conceptual diagram illustrating a signal processing methodfor transmitting a downlink signal by a base station (BS).

Referring to FIG. 3B, the BS can transmit one or more codewords via adownlink in a 3GPP LTE system. Codewords may be processed as complexsymbols by the scrambling module 301 and the modulation mapper 302 inthe same manner as in the uplink operation shown in FIG. 3A. Thereafter,the complex symbols are mapped to a plurality of layers by the layermapper 303, and each layer is multiplied by a predetermined precodingmatrix and is then allocated to each transmission antenna by theprecoder 304. The processed transmission signals of individual antennasare mapped to time-frequency resource elements (REs) to be used for datatransmission by the RE mapper 305. Thereafter, the mapped result may betransmitted via each antenna after passing through the OFDMA signalgenerator 306.

In the case where a UE for use in a wireless communication systemtransmits an uplink signal, a Peak to Average Power Ratio (PAPR) maybecome more serious than in the case where the BS transmits a downlinksignal. Thus, as described in FIGS. 3A and 3B, the SC-FDMA scheme isused for uplink signal transmission in a different way from the OFDMAscheme used for downlink signal transmission.

FIG. 4 is a conceptual diagram illustrating an SC-FDMA scheme and anOFDMA scheme applicable to embodiments of the present invention. In the3GPP system, the OFDMA scheme is used in downlink and the SC-FDMA schemeis used in uplink.

Referring to FIG. 4, not only a UE for uplink signal transmission butalso a BS for downlink signal transmission includes a Serial-to-Parallelconverter 401, a subcarrier mapper 403, an M-point IDFT module 404 and aCyclic Prefix (CP) addition module 406. However, a UE for transmitting asignal using the SC-FDMA scheme further includes an N-point DFT module402, and compensates for a predetermined part of the IDFT processinginfluence of the M-point IDFT module 1504 so that a transmission signalcan have single carrier characteristics (i.e., single-carrierproperties).

FIG. 5 illustrates a signal mapping scheme in the frequency domain forsatisfying the single carrier properties. FIG. 5 (a) shows a localizedmapping scheme and FIG. 5 (b) shows a distributed mapping scheme.

A clustered SC-FDMA scheme which is a modified form of the SC-FDMAscheme is described as follows. In the clustered SC-FDMA scheme, DFTprocess output samples are divided into sub-groups in a subcarriermapping procedure and are non-contiguously mapped in the frequencydomain (or subcarrier domain)

FIG. 6 shows signal processing in which DFT-process output samples aremapped to one carrier in the clustered SC-FDMA. FIGS. 7 and 8 showsignal processing in which DFT process output samples are mapped tomulticarriers in a clustered SC-FDMA. FIG. 6 shows the example ofintra-carrier cluster SC-FDMA application. FIGS. 7 and 8 show examplesof the inter-carrier clustered SC-FDMA application. FIG. 7 shows theexample in which a signal is generated through a single IFFT block underthe condition that component carriers are contiguously allocated to afrequency domain and the subcarrier spacing between contiguous componentcarriers is arranged. FIG. 8 shows another example in which a signal isgenerated through several IFFT blocks under the condition that componentcarriers are non-contiguously allocated to a frequency domain.

FIG. 9 shows exemplary segmented SC-FDMA signal processing.

The segmented SC-FDMA to which the same number of IFFTs as an arbitrarynumber of DFTs is applied may be considered to be an extended version ofthe conventional SC-FDMA DFT spread and the IFFT frequency subcarriermapping structure because the relationship between DFT and IFFT isone-to-one basis. If necessary, the segmented SC-FDMA may also berepresented by NxSC-FDMA or NxDFT-s-OFDMA. For convenience ofdescription and better understanding of the present invention, thesegmented SC-FDMA, NxSC-FDMA and NxDFT-s-OFDMA may be genericallyreferred to as ‘segment SC-FDMA’. Referring to FIG. 9, in order toreduce single carrier characteristics, the segment SC-FDMA groups allthe time domain modulation symbols into N groups, such that a DFTprocess is performed in units of a group.

FIG. 10 shows an uplink subframe structure.

As shown in FIG. 10, the UL subframe includes a plurality of slots(e.g., two slots). Each slot may include a plurality of SC-FDMA symbols,the number of which varies according to the length of a CP. For example,in the case of a normal CP, a slot may include seven SC-FDMA symbols. AUL subframe is divided into a data region and a control region. The dataregion includes a PUSCH and is used to transmit a data signal such asvoice. The control region includes a PUCCH and is used to transmitcontrol information. The PUCCH includes a pair of RBs (e.g., m=0, 1, 2,3) located at both ends of the data region on the frequency axis(specifically, a pair of RBs at frequency mirrored locations) and hopsbetween slots. The UL control information (i.e., UCI) includes HARQACK/NACK, Channel Quality Information (CQI), Precoding Matrix Indicator(PMI), and Rank Indication (RI).

FIG. 11 illustrates a signal processing procedure for transmitting aReference Signal (RS) in the uplink. As shown in FIG. 11, data istransformed into a frequency domain signal by a DFT precoder and thesignal is then transmitted after being subjected to frequency mappingand IFFT. On the other hand, an RS does not pass through the DFTprecoder. More specifically, an RS sequence is directly generated in thefrequency domain (S11) and is then transmitted after being sequentiallysubjected to a localized-mapping process (S12), an IFFT process (S13),and a CP attachment process (S14).

The RS sequence r_(u,v) ^((α))(n) is defined by a cyclic shift α of abase sequence and may be expressed by the following equation 1.

r _(u,v) ^((α))(n)=e ^(jαn) r _(u,v)(n), 0≤n<M _(sc) ^(RS),   [Equation1]

where M_(sc) ^(RS)=mN_(sc) ^(RB) denotes the length of the RS sequence,N_(sc) ^(RB) denotes the size of a resource block represented insubcarriers, and m is 1≤m≤N_(RB) ^(max,UL). N_(RB) ^(max,UL) denotes amaximum UL transmission band.

A base sequence r _(u,v)(n) is divided into several groups. u∈{0,1, . .. , 29} denotes group number, and v corresponds to a base sequencenumber in a corresponding group. Each group includes one base sequencev=0 having a length of M_(sc) ^(RS)=mN_(sc) ^(RB) (1≤m≤5) and two basesequences v=0,1 having a length of M_(sc) ^(RS)=mN_(sc) ^(RB)(6≤m≤N_(RB) ^(max,UL)). The sequence group number u and the number vwithin a corresponding group may be changed with time. The base sequencer _(u,v)(0), . . . , r _(u,v)(M_(sc) ^(RS)−1) is defined based on asequence length M_(sc) ^(RS).

The base sequence having a length of 3N_(sc) ^(RB) or more may bedefined as follows.

With respect to M_(sc) ^(RS)≥3N_(sc) ^(RB), the base sequence r_(u,v)(0), . . . , r _(u,v)(M_(sc) ^(RS)−1) is given by the followingequation 2.

r _(u,v)(n)=x_(q)(n mod N _(ZC) ^(RS)), 0≤n<M _(sc) ^(RS),   [Equation2]

where a q-th root Zadoff-Chu sequence may be defined by the followingequation 3.

$\begin{matrix}{{{x_{q}(m)} = e^{{- j}\frac{\pi \; {{qm}{({m + 1})}}}{N_{ZC}^{RS}}}},{0 \leq m \leq {N_{ZC}^{RS} - 1}},} & \left\lbrack {{Equation}\mspace{14mu} 3} \right\rbrack\end{matrix}$

where q satisfies the following equation 4.

q=└q+½┘+v·(−1)^(└2q┘)  [Equation 4]

q=N _(ZC) ^(RS)·(u+1)/31,

where the length N_(AC) ^(RS) of the Zadoff-Chu sequence is given by thelargest prime number, thus satisfying N_(ZC) ^(RS)<M_(sc) ^(RS).

A base sequence having a length of less than 3N_(sc) ^(RB) may bedefined as follows. First, for M_(sc) ^(RS)=N_(sc) ^(RB) and M_(sc)^(RS)=2N_(sc) ^(RB), the base sequence is given as shown in Equation 5.

r _(u,v)(n)=e ^(jφ(n)π/4), 0≤n≤M _(sc) ^(RS)−1,   [Equation 5]

where values φ(n) for M_(sc) ^(RS)=N_(sc) ^(RB) and M_(sc) ^(RS)=2N_(sc)^(RB) are given by the following Table 1, respectively.

TABLE 1 u φ(0), . . . , φ(11) 0 −1 1 3 −3 3 3 1 1 3 1 −3 3 1 1 1 3 3 3−1 1 −3 −3 1 −3 3 2 1 1 −3 −3 −3 −1 −3 −3 1 −3 1 −1 3 −1 1 1 1 1 −1 −3−3 1 −3 3 −1 4 −1 3 1 −1 1 −1 −3 −1 1 −1 1 3 5 1 −3 3 −1 −1 1 1 −1 −1 3−3 1 6 −1 3 −3 −3 −3 3 1 −1 3 3 −3 1 7 −3 −1 −1 −1 1 −3 3 −1 1 −3 3 1 81 −3 3 1 −1 −1 −1 1 1 3 −1 1 9 1 −3 −1 3 3 −1 −3 1 1 1 1 1 10 −1 3 −1 11 −3 −3 −1 −3 −3 3 −1 11 3 1 −1 −1 3 3 −3 1 3 1 3 3 12 1 −3 1 1 −3 1 1 1−3 −3 −3 1 13 3 3 −3 3 −3 1 1 3 −1 −3 3 3 14 −3 1 −1 −3 −1 3 1 3 3 3 −11 15 3 −1 1 −3 −1 −1 1 1 3 1 −1 −3 16 1 3 1 −1 1 3 3 3 −1 −1 3 −1 17 −31 1 3 −3 3 −3 −3 3 1 3 −1 18 −3 3 1 1 −3 1 −3 −3 −1 −1 1 −3 19 −1 3 1 31 −1 −1 3 −3 −1 −3 −1 20 −1 −3 1 1 1 1 3 1 −1 1 −3 −1 21 −1 3 −1 1 −3 −3−3 −3 −3 1 −1 −3 22 1 1 −3 −3 −3 −3 −1 3 −3 1 −3 3 23 1 1 −1 −3 −1 −3 1−1 1 3 −1 1 24 1 1 3 1 3 3 −1 1 −1 −3 −3 1 25 1 −3 3 3 1 3 3 1 −3 −1 −13 26 1 3 −3 −3 3 −3 1 −1 −1 3 −1 −3 27 −3 −1 −3 −1 −3 3 1 −1 1 3 −3 −328 −1 3 −3 3 −1 3 3 −3 3 3 −1 −1 29 3 −3 −3 −1 −1 −3 −1 3 −3 3 1 −1

TABLE 2 u φ(0), . . . , φ(23) 0 −1 3 1 −3 3 −1 1 3 −3 3 1 3 −3 3 1 1 −11 3 −3 3 −3 −1 −3 1 −3 3 −3 −3 −3 1 −3 −3 3 −1 1 1 1 3 1 −1 3 −3 −3 1 31 1 −3 2 3 −1 3 3 1 1 −3 3 3 3 3 1 −1 3 −1 1 1 −1 −3 −1 −1 1 3 3 3 −1 −31 1 3 −3 1 1 −3 −1 −1 1 3 1 3 1 −1 3 1 1 −3 −1 −3 −1 4 −1 −1 −1 −3 −3 −11 1 3 3 −1 3 −1 1 −1 −3 1 −1 −3 −3 1 −3 −1 −1 5 −3 1 1 3 −1 1 3 1 −3 1−3 1 1 −1 −1 3 −1 −3 3 −3 −3 −3 1 1 6 1 1 −1 −1 3 −3 −3 3 −3 1 −1 −1 1−1 1 1 −1 −3 −1 1 −1 3 −1 −3 7 −3 3 3 −1 −1 −3 −1 3 1 3 1 3 1 1 −1 3 1−1 1 3 −3 −1 −1 1 8 −3 1 3 −3 1 −1 −3 3 −3 3 −1 −1 −1 −1 1 −3 −3 −3 1 −3−3 −3 1 −3 9 1 1 −3 3 3 −1 −3 −1 3 −3 3 3 3 −1 1 1 −3 1 −1 1 1 −3 1 1 10−1 1 −3 −3 3 −1 3 −1 −1 −3 −3 −3 −1 −3 −3 1 −1 1 3 3 −1 1 −1 3 11 1 3 3−3 −3 1 3 1 −1 −3 −3 −3 3 3 −3 3 3 −1 −3 3 −1 1 −3 1 12 1 3 3 1 1 1 −1−1 1 −3 3 −1 1 1 −3 3 3 −1 −3 3 −3 −1 −3 −1 13 3 −1 −1 −1 −1 −3 −1 3 3 1−1 1 3 3 3 −1 1 1 −3 1 3 −1 −3 3 14 −3 −3 3 1 3 1 −3 3 1 3 1 1 3 3 −1 −1−3 1 −3 −1 3 1 1 3 15 −1 −1 1 −3 1 3 −3 1 −1 −3 −1 3 1 3 1 −1 −3 −3 −1−1 −3 −3 −3 −1 16 −1 −3 3 −1 −1 −1 −1 1 1 −3 3 1 3 3 1 −1 1 −3 1 −3 1 1−3 −1 17 1 3 −1 3 3 −1 −3 1 −1 −3 3 3 3 −1 1 1 3 −1 −3 −1 3 −1 −1 −1 181 1 1 1 1 −1 3 −1 −3 1 1 3 −3 1 −3 −1 1 1 −3 −3 3 1 1 −3 19 1 3 3 1 −1−3 3 −1 3 3 3 −3 1 −1 1 −1 −3 −1 1 3 −1 3 −3 −3 20 −1 −3 3 −3 −3 −3 −1−1 −3 −1 −3 3 1 3 −3 −1 3 −1 1 −1 3 −3 1 −1 21 −3 −3 1 1 −1 1 −1 1 −1 31 −3 −1 1 −1 1 −1 −1 3 3 −3 −1 1 −3 22 −3 −1 −3 3 1 −1 −3 −1 −3 −3 3 −33 −3 −1 1 3 1 −3 1 3 3 −1 −3 23 −1 −1 −1 −1 3 3 3 1 3 3 −3 1 3 −1 3 −1 33 −3 3 1 −1 3 3 24 1 −1 3 3 −1 −3 3 −3 −1 −1 3 −1 3 −1 −1 1 1 1 1 −1 −1−3 −1 3 25 1 −1 1 −1 3 −1 3 1 1 −1 −1 −3 1 1 −3 1 3 −3 1 1 −3 −3 −1 −126 −3 −1 1 3 1 1 −3 −1 −1 −3 3 −3 3 1 −3 3 −3 1 −1 1 −3 1 1 1 27 −1 −3 33 1 1 3 −1 −3 −1 −1 −1 3 1 −3 −3 −1 3 −3 −1 −3 −1 −3 −1 28 −1 −3 −1 −1 1−3 −1 −1 1 −1 −3 1 1 −3 1 −3 −3 3 1 1 −1 3 −1 −1 29 1 1 −1 −1 −3 −1 3 −13 −1 1 3 1 −1 3 1 3 −3 −3 1 −1 −1 1 3

RS hopping is described below.

The sequence group number u in a slot n_(s) may be defined as shown inthe following equation 6 by a group hopping pattern ƒ_(gh)(n_(s)) and asequence shift pattern ƒ_(ss).

u=(ƒ_(gh)(n _(s))+ƒ_(ss))mod30,   [Equation 6]

where mod denotes a modulo operation.

17 different hopping patterns and 30 different sequence shift patternsare present. Sequence group hopping may be enabled or disabled by aparameter for activating group hopping provided by a higher layer.

Although the PUCCH and the PUSCH have the same hopping pattern, thePUCCH and the PUSCH may have different sequence shift patterns.

The group hopping pattern ƒ_(gh)(n_(s)) is the same for the PUSCH andthe PUCCH and is given by the following equation 7.

$\begin{matrix}{{f_{gh}\left( n_{s} \right)} = \left\{ \begin{matrix}0 & {{if}\mspace{14mu} {group}\mspace{14mu} {hopping}\mspace{14mu} {is}\mspace{14mu} {disabled}} \\\begin{matrix}\left( {\sum_{i = 0}^{7}{{c\left( {{8n_{s}} + i} \right)} \cdot 2^{i}}} \right) \\{{mod}\mspace{14mu} 30}\end{matrix} & {{{if}\mspace{14mu} {group}\mspace{14mu} {hopping}\mspace{14mu} {is}\mspace{14mu} {enabled}},}\end{matrix} \right.} & \left\lbrack {{Equation}\mspace{14mu} 7} \right\rbrack\end{matrix}$

where c(i) denotes a pseudo-random sequence and a pseudo-random sequencegenerator may be initialized by

$c_{init} = \left\lfloor \frac{N_{ID}^{cell}}{30} \right\rfloor$

at the start of each radio frame.

The definition of the sequence shift pattern ƒ_(ss) varies between thePUCCH and the PUSCH.

The sequence shift pattern ƒ_(ss) ^(PUCCH) of the PUCCH is ƒ_(ss)^(PUCCH)=N_(ID) ^(cell) mod30 and the sequence shift pattern ƒ_(ss)^(PUSCH) of the PUSCH is ƒ_(ss) ^(PUSCH)=(ƒ_(ss) ^(PUCCH)+Δ_(ss)) mod30.Δ_(ss)∈{0,1, . . . , 29} is configured by a higher layer.

The following is a description of sequence hopping.

Sequence hopping is applied only to an RS having a length of M_(sc)^(RS)≥6N_(sc) ^(RB).

For an RS having a length of M_(sc) ^(RS)<6N_(sc) ^(RB), a base sequencenumber v within a base sequence group is v=0.

For an RS having a length of M_(sc) ^(RS)≥6N_(sc) ^(RB), a base sequencenumber v within a base sequence group in a slot n_(s) is given by thefollowing equation 8.

$\begin{matrix}{v = \left\{ \begin{matrix}{c\left( n_{s} \right)} & \begin{matrix}{{if}\mspace{14mu} {group}\mspace{14mu} {hopping}\mspace{14mu} {is}\mspace{14mu} {disabled}\mspace{14mu} {and}} \\{{sequence}\mspace{14mu} {hopping}\mspace{14mu} {is}\mspace{14mu} {enabled}}\end{matrix} \\0 & {{otherwise},}\end{matrix} \right.} & \left\lbrack {{Equation}\mspace{20mu} 8} \right\rbrack\end{matrix}$

where c(i) denotes a pseudo-random sequence and a parameter for enablingsequence hopping provided by a higher layer determines whether or notsequence hopping is possible. The pseudo-random sequence generator maybe initialized as

$c_{init} = {{\left\lfloor \frac{N_{ID}^{cell}}{30} \right\rfloor \cdot 2^{5}} + f_{ss}^{PUSCH}}$

at the start of a radio frame.

An RS for a PUSCH is determined in the following manner.

The RS sequence r^(PUSCH)(·) for the PUCCH is defined asr_(PUSCH)(m·M_(sc) ^(RS)+n)=r_(u,v) ^((α))(n). Here, m and n satisfy

m = 0, 1 n = 0, … , M_(sc)^(RS) − 1

and satisfy M_(sc) ^(RS)=M_(sc) ^(PUSCH).

A cyclic shift in one slot is given by a α=2□ n_(cs)/12 together withn_(cs)=(n_(DMRS) ⁽¹⁾+n_(DMRS) ⁽²⁾+n_(PRS) (n_(s))) mod12.

Here, n_(DMRS) ⁽¹⁾ is a broadcast value, n_(DMRS) ⁽²⁾ is given by ULscheduling allocation, and n_(PRS)(n_(s)) is a cell-specific cyclicshift value. n_(PRS)(n_(s)) varies according to a slot number n_(s), andis given by n_(PRS)(n_(s))=Σ_(t=0) ⁷c(8·n_(s)+i)·2^(i).

c(i) is a pseudo-random sequence and c(i) is also a cell-specific value.The pseudo-random sequence generator may be initialized as

$c_{init} = {{\left\lfloor \frac{N_{ID}^{cell}}{30} \right\rfloor \cdot 2^{5}} + f_{ss}^{PUSCH}}$

at the start of a radio frame.

Table 3 shows a cyclic shift field and n_(DMRS) ⁽²⁾ at a downlinkcontrol information (DCI) format 0.

TABLE 3 Cyclic shift field at DCI format 0 n_(DMRS) ⁽²⁾ 000 0 001 2 0103 011 4 100 6 101 8 110 9 111 10

A physical mapping method for a UL RS at a PUSCH is as follows.

A sequence is multiplied by an amplitude scaling factor β_(PUSCH) and ismapped to the same physical resource block (PRB) set used for thecorresponding PUSCH within the sequence that starts at r_(PUSCH)(0).When the sequence is mapped to a resource element (k, l) (l=3 for anormal CP and l=2 for an extended CP) within a subframe, the order of kis first increased and the slot number is then increased.

In summary, a ZC sequence is used along with cyclic extension if thelength is greater than or equal to 3N_(sc) ^(RB) and acomputer-generated sequence is used if the length is less than 3N_(sc)^(RB). The cyclic shift is determined according to a cell-specificcyclic shift, a UE-specific cyclic shift, a hopping pattern, and thelike.

FIG. 12A illustrates the structure of a demodulation reference signal(DMRS) for a PUSCH in the case of normal CP and FIG. 12B illustrates thestructure of a DMRS for a PUSCH in the case of extended CP. In thestructure of FIG. 12A, a DMRS is transmitted through fourth and eleventhSC-FDMA symbols and, in the structure of FIG. 12B, a DMRS is transmittedthrough third and ninth SC-FDMA symbols.

FIGS. 13 to 16 illustrate a slot level structure of a PUCCH format. ThePUCCH includes the following formats in order to transmit controlinformation.

(1) Format 1: Used for on-off keying (OOK) modulation and schedulingrequest (SR)

(2) Format 1a and Format 1b: Used for ACK/NACK transmission

-   -   1) Format 1a: BPSK ACK/NACK for one codeword    -   2) Format 1b: QPSK ACK/NACK for two codewords

(3) Format 2: Used for QPSK modulation and CQI transmission

(4) Format 2a and Format 2b: Used for CQI and ACK/NACK simultaneoustransmission.

Table 4 shows a modulation scheme and the number of bits per subframeaccording to PUCCH format. Table 5 shows the number of RSs per slotaccording to PUCCH format. Table 6 shows SC-FDMA symbol locations of anRS according to PUCCH format. In Table 4, the PUCCH formats 2a and 2bcorrespond to the case of normal CP.

TABLE 4 PUCCH Number of bits per subframe, format Modulation schemeM_(bit) 1 N/A N/A 1a BPSK 1 1b QPSK 2 2 QPSK 20 2a QPSK + BPSK 21 2bQPSK + BPSK 22

TABLE 5 PUCCH format Normal CP Extended CP 1, 1a, 1b 3 2 2 2 1 2a, 2b 2N/A

TABLE 6 PUCCH SC-FDMA symbol location of RS format Normal CP Extended CP1, 1a, 1b 2, 3, 4 2, 3 2, 2a, 2b 1, 5 3

FIG. 13 shows a PUCCH format 1a and 1b structure in the case of a normalCP. FIG. 14 shows a PUCCH format 1a and 1b structure in the case of anextended CP. In the PUCCH format 1a and 1b structure, the same controlinformation is repeated in each slot within a subframe. UEs transmitACK/NACK signals through different resources that include orthogonalcovers or orthogonal cover codes (OCs or OCCs) and different cyclicshifts (i.e., different frequency domain codes) of a Computer-GeneratedConstant Amplitude Zero Auto Correlation (CG-CAZAC) sequence. Forexample, the OCs may include orthogonal Walsh/DFT codes. When the numberof CSs is 6 and the number of OCs is 3, a total of 18 UEs may bemultiplexed in the same Physical Resource Block (PRB) based on a singleantenna. Orthogonal sequences w0, w1, w2, and w3 may be applied to anarbitrary time domain (after FFT modulation) or an arbitrary frequencydomain (before FFT modulation).

For SR and persistent scheduling, ACK/NACK resources composed of CSs,OCs and PRBs may be assigned to UEs through Radio Resource Control(RRC). For dynamic ACK/NACK and non-persistent scheduling, ACK/NACKresources may be implicitly assigned to the UE using the lowest CCEindex of a PDCCH corresponding to the PDSCH.

FIG. 15 shows a PUCCH format 2/2a/2b structure in the case of the normalCP. FIG. 16 shows a PUCCH format 2/2a/2b structure in the case of theextended CP. As shown in FIGS. 15 and 16, one subframe includes 10 QPSKdata symbols in addition to an RS symbol in the normal CP case. EachQPSK symbol is spread in the frequency domain by a CS and is then mappedto a corresponding SC-FDMA symbol. SC-FDMA symbol level CS hopping maybe applied in order to randomize inter-cell interference. RSs may bemultiplexed by CDM using a CS. For example, if it is assumed that thenumber of available CSs is 12 or 6, 12 or 6 UEs may be multiplexed inthe same PRB. For example, in PUCCH formats 1/1a/1b and 2/2a/2b, aplurality of UEs may be multiplexed by CS+OC+PRB and CS+PRB.

Length-4 and length-3 orthogonal sequences (OCs) for PUCCH formats1/1a/1b are shown in the following Tables 7 and 8.

TABLE 7 Length-4 orthogonal sequences for PUCCH formats 1/1a/1b Sequenceindex n_(oc) (n_(s)) Orthogonal sequences [w(0) . . . w(N_(SF) ^(PUCCH)− 1)] 0 Error! Objects cannot be created from editing field codes. 1Error! Objects cannot be created from editing field codes. 2 Error?Objects cannot be created from editing field codes.

TABLE 8 Length-3 orthogonal sequences for PUCCH formats 1/1a/1b Sequenceindex n_(oc) (n_(s)) Orthogonal sequences [w(0) . . . w(N_(SF) ^(PUCCH)− 1)] 0 [1 1 1] 1 [1 e^(j2π/3) e^(j4π/3)] 2 [1 e^(j4π/3) e^(j2π/3)]

The orthogonal sequences (OCs) for the RS in the PUCCH formats 1/1a/1bare shown in Table 9.

TABLE 9 1a and 1b Sequence index n _(oc) (n_(s)) Normal cyclic prefixExtended cyclic prefix 0 [1 1 1] [1 1] 1 [1 e^(j2π/3) e^(j4π/3)]   [1−1] 2 [1 e^(j4π/3) e^(j2π/3)] N/A

FIG. 17 illustrates ACK/NACK channelization for PUCCH formats 1a and 1bwhen Δ_(shift) ^(PUCCH)−2.

FIG. 18 illustrates channelization of a structure in which PUCCH formats1/1a/1b and PUCCH formats 2/2a/2b are mixed within the same PRB.

CS (Cyclic Shift) hopping and OC (Orthogonal Cover) remapping may beapplied as follows.

-   -   (1) Symbol-based cell-specific CS hopping for inter-cell        interference randomization    -   (2) Slot level CS/OC remapping        -   1) For inter-cell interference randomization        -   2) Slot-based access for mapping between ACK/NACK channels            and resources (k)

A resource n_(r) for PUCCH formats 1/1a/1b includes the followingcombination.

-   -   (1) CS (=DFT OC in a symbol level) (n_(cs))    -   (2) OC (OC in a slot level) (n_(oc))    -   (3) Frequency RB (n_(rb))

When indices representing the CS, the OC and the RB are n_(cs), n_(oc)and n_(rb), respectively, a representative index n_(r) includes n_(cs),n_(oc) and n_(rb). That is, n_(r)=(n_(cs), n_(oc), n_(rb)).

A CQI, a PMI, an RI, and a combination of a CQI and an ACK/NACK may betransmitted through PUCCH formats 2/2a/2b. Here, Reed Muller (RM)channel coding may be applied.

For example, in the LTE system, channel coding for a UL CQI is describedas follows. A bit stream α₀, α₁, α₂, α₃, . . . , α_(A-1) ischannel-coded using a (20, A) RM code. Table 10 shows a base sequencefor the (20, A) code. α₀ and α_(A-1) represent a Most Significant Bit(MSB) and a Least Significant Bit (LSB), respectively. In the extendedCP case, the maximum number of information bits is 11, except when theCQI and the ACK/NACK are simultaneously transmitted. After the bitstream is coded into 20 bits using the RM code, QPSK modulation may beapplied to the encoded bits. Before QPSK modulation, the encoded bitsmay be scrambled.

TABLE 10 I M_(i, 0) M_(i, 1) M_(i, 2) M_(i, 3) M_(i, 4) M_(i, 5)M_(i, 6) M_(i, 7) M_(i, 8) M_(i, 9) M_(i, 10) M_(i, 11) M_(i, 12) 0 1 10 0 0 0 0 0 0 0 1 1 0 1 1 1 1 0 0 0 0 0 0 1 1 1 0 2 1 0 0 1 0 0 1 0 1 11 1 1 3 1 0 1 1 0 0 0 0 1 0 1 1 1 4 1 1 1 1 0 0 0 1 0 0 1 1 1 5 1 1 0 01 0 1 1 1 0 1 1 1 6 1 0 1 0 1 0 1 0 1 1 1 1 1 7 1 0 0 1 1 0 0 1 1 0 1 11 8 1 1 0 1 1 0 0 1 0 1 1 1 1 9 1 0 1 1 1 0 1 0 0 1 1 1 1 10 1 0 1 0 0 11 1 0 1 1 1 1 11 1 1 1 0 0 1 1 0 1 0 1 1 1 12 1 0 0 1 0 1 0 1 1 1 1 1 113 1 1 0 1 0 1 0 1 0 1 1 1 1 14 1 0 0 0 1 1 0 1 0 0 1 0 1 15 1 1 0 0 1 11 1 0 1 1 0 1 16 1 1 1 0 1 1 1 0 0 1 0 1 1 17 1 0 0 1 1 1 0 0 1 0 0 1 118 1 1 0 1 1 1 1 1 0 0 0 0 0 19 1 0 0 0 0 1 1 0 0 0 0 0 0

Channel coding bits b₀, b₁, b₂, b₃, . . . , b_(B-1) may be generated byEquation 9.

$\begin{matrix}{{b_{i} = {\sum\limits_{n = 0}^{A - 1}{\left( {a_{n} \cdot M_{i,n}} \right){mod}\mspace{11mu} 2}}},} & \left\lbrack {{Equation}\mspace{14mu} 9} \right\rbrack\end{matrix}$

where i=0, 1, 2, . . . , B−1.

Table 11 shows an uplink control information (UCI) field for broadbandreporting (single antenna port, transmit diversity or open loop spatialmultiplexing PDSCH) CQI feedback.

TABLE 11 Field Bandwidth Wideband CQI 4

Table 12 shows a UCI field for wideband CQI and PMI feedback. The fieldreports closed loop spatial multiplexing PDSCH transmission.

TABLE 12 Bandwidth 2 antenna ports 4 antenna ports Field Rank = 1 Rank =2 Rank = 1 Rank > 1 Wideband CQI 4 4 4 4 Spatial differential CQI 0 3 03 PMI (Precoding Matrix 2 1 4 4 Index)

Table 13 shows a UCI field for RI feedback for wideband reporting.

TABLE 13 Bit widths 2 4 antenna ports Field antenna ports Up to twolayers Up to four layers RI (Rank Indication) 1 1 2

FIG. 19 shows PRB allocation. As shown in FIG. 19, the PRB may be usedfor PUCCH transmission in slot n_(s).

The term “multi-carrier system” or “carrier aggregation system” refersto a system for aggregating and utilizing a plurality of carriers havinga bandwidth smaller than a target bandwidth for broadband support. Whena plurality of carriers having a bandwidth smaller than a targetbandwidth is aggregated, the bandwidth of the aggregated carriers may belimited to a bandwidth used in the existing system for backwardcompatibility with the existing system. For example, the existing LTEsystem may support bandwidths of 1.4, 3, 5, 10, 15 and 20 MHz and anLTE-Advanced (LTE-A) system evolved from the LTE system may support abandwidth greater than 20 MHz using only the bandwidths supported by theLTE system. Alternatively, regardless of the bandwidths used in theexisting system, a new bandwidth may be defined so as to support carrieraggregation. The term “multi-carrier” may be used interchangeably withthe terms “carrier aggregation” and “bandwidth aggregation”. The term“carrier aggregation” may refer to both contiguous carrier aggregationand non-contiguous carrier aggregation.

FIG. 20 is a conceptual diagram illustrating management of downlinkcomponent carriers (DL CCs) in a base station (BS) and FIG. 21 is aconceptual diagram illustrating management of uplink component carriers(UL CCs) in a user equipment (UE). For ease of explanation, the higherlayer is simply described as a MAC (or a MAC entity) in the followingdescription of FIGS. 20 and 21.

FIG. 22 is a conceptual diagram illustrating management of multiplecarriers by one MAC entity in a BS. FIG. 23 is a conceptual diagramillustrating management of multiple carriers by one MAC entity in a UE.

As shown in FIGS. 22 and 23, one MAC manages and operates one or morefrequency carriers to perform transmission and reception. Frequencycarriers managed by one MAC need not be contiguous and as such they aremore flexible in terms of resource management. In FIGS. 22 and 23, it isassumed that one PHY (or PHY entity) corresponds to one componentcarrier (CC) for ease of explanation. One PHY does not always indicatean independent radio frequency (RF) device. Although one independent RFdevice generally corresponds to one PHY, the present invention is notlimited thereto and one RF device may include a plurality of PHYs.

FIG. 24 is a conceptual diagram illustrating management of multiplecarriers by a plurality of MAC entities in a BS. FIG. 25 is a conceptualdiagram illustrating management of multiple carriers by a plurality ofMAC entities in a UE. FIG. 26 illustrates another scheme of managementof multiple carriers by a plurality of MAC entities in a BS. FIG. 27illustrates another scheme of management of multiple carriers by aplurality of MAC entities in a UE.

Unlike the structures of FIGS. 22 and 23, a number of carriers may becontrolled by a number of MAC entities rather than by one MAC as shownin FIGS. 24 to 27.

As shown in FIGS. 24 and 25, carriers may be controlled by MACs on a oneto one basis. As shown in FIGS. 26 and 27, some carriers may becontrolled by MACs on a one to one basis and one or more remainingcarriers may be controlled by one MAC.

The above-mentioned system includes a plurality of carriers (i.e., 1 toN carriers) and carriers may be used so as to be contiguous ornon-contiguous to each other. This scheme may be equally applied to ULand DL. The TDD system is constructed so as to manage N carriers, eachincluding downlink and uplink transmission, and the FDD system isconstructed such that multiple carriers are applied to each of uplinkand downlink. The FDD system may also support asymmetrical carrieraggregation in which the numbers of carriers aggregated in uplink anddownlink and/or the bandwidths of carriers in uplink and downlink aredifferent.

When the number of component carriers (CCs) aggregated in uplink (UL) isidentical to the number of CCs aggregated in downlink (DL), all CCs maybe configured so as to be compatible with the conventional system.However, this does not mean that CCs that are configured without takinginto consideration such compatibility are excluded from the presentinvention.

Hereinafter, it is assumed for ease of explanation description that,when a PDCCH is transmitted through DL component carrier #0, a PDSCHcorresponding to the PDCCH is transmitted through DL component carrier#0. However, it is apparent that cross-carrier scheduling may be appliedsuch that the PDSCH is transmitted through a different DL componentcarrier. The term “component carrier” may be replaced with otherequivalent terms (e.g., cell).

FIG. 28 shows a scenario in which uplink control information (UCI) istransmitted in a radio communication system supporting carrieraggregation (CA). For ease of explanation, it is assumed in this examplethat the UCI is ACK/NACK (A/N). However, the UCI may include controlinformation such as channel state information (CSI) (e.g., CQI, PMI, RI,etc.) or scheduling request information (e.g., SR, etc.).

FIG. 28 shows asymmetric carrier aggregation in which 5 DL CCs and oneUL CC are linked. The illustrated asymmetric carrier aggregation may beset from the viewpoint of UCI transmission. That is, a DL CC-UL CClinkage for UCI and a DL CC-UL CC linkage for data may be setdifferently. When it is assumed for ease of explanation that one DL CCcan carry up to two codewords, at least two ACK/NACK bits are needed. Inthis case, in order to transmit an ACK/NACK for data received through 5DL CCs through one UL CC, at least 10 ACK/NACK bits are needed. In orderto also support a discontinuous transmission (DTX) state for each DL CC,at least 12 bits (=5⁵=3125=11.61 bits) are needed for ACK/NACKtransmission. The conventional PUCCH format 1a/1b structure cannottransmit such extended ACK/NACK information since the conventional PUCCHformat 1a/1b structure can transmit up to 2 ACK/NACK bits. Althoughcarrier aggregation has been illustrated as a cause of an increase inthe amount of UCI information, the amount of UCI information may also beincreased due to an increase in the number of antennas and the presenceof a backhaul subframe in a TDD system or a relay system. Similar to thecase of ACK/NACK, the amount of control information that should betransmitted is increased even when control information associated with aplurality of DL CCs is transmitted through one UL CC. For example, UCIpayload may be increased when there is a need to transmit a CQI/PMI/RIfor a plurality of DL CCs.

A DL primary CC may be defined as a DL CC linked with a UL primary CC.Here, linkage includes implicit and explicit linkage. In LTE, one DL CCand one UL CC are uniquely paired. For example, a DL CC that is linkedwith a UL primary CC by LTE pairing may be referred to as a DL primaryCC. This may be regarded as implicit linkage. Explicit linkage indicatesthat a network configures the linkage in advance and may be signaled byRRC or the like. In explicit linkage, a DL CC that is paired with a ULprimary CC may be referred to as a primary DL CC. A UL primary (oranchor) CC may be a UL CC in which a PUCCH is transmitted.Alternatively, the UL primary CC may be a UL CC in which UCI istransmitted through a PUCCH or a PUSCH. The DL primary CC may also beconfigured through higher layer signaling. The DL primary CC may be a DLCC in which a UE performs initial access. DL CCs other than the DLprimary CC may be referred to as DL secondary CCs. Similarly, UL CCsother than the UL primary CC may be referred to as UL secondary CCs.

LTE-A uses the concept of a cell so as to manage radio resources. Thecell is defined as a combination of DL resources and UL resources. Here,the UL resources are not an essential part. Accordingly, the cell can beconfigured with DL resources only, or DL resources and UL resources.When CA is supported, the linkage between a carrier frequency (or DL CC)of a DL resource and a carrier frequency (or UL CC) of a UL resource canbe designated by system information. A cell operating at a primaryfrequency (or PCC) can be referred to as a Primary Cell (PCell) and acell operating at a secondary frequency (or SCC) can be referred to as aSecondary Cell (SCell). DL CC may also be referred to as DL Cell, and ULCC may also be referred to as UL Cell. In addition, the anchor (orprimary) DL CC may also be referred to as DL PCell, and the anchor (orprimary) UL CC may also be referred to as UL PCell. The PCell is usedfor a UE to perform an initial connection establishment procedure or aconnection re-establishment procedure. The PCell may refer to a celldesignated during a handover procedure. The SCell can be configuredafter RRC connection is established and used to provide additional radioresources. The PCell and the SCell can be called a serving cell.Accordingly, for a UE that does not support CA while in an RRC_connectedstate, only one serving cell configured with a PCell exists. Conversely,for a UE that is in an RRC_Connected state and supports CA, one or moreserving cells including a PCell and a SCell are provided. For CA, anetwork can configure one or more SCells for a UE that supports CA inaddition to a PCell initially configured during a connectionestablishment procedure after an initial security activation procedure.

DL-UL may correspond only to FDD. DL-UL pairing may not be defined forTDD since TDD uses the same frequency. In addition, a DL-UL linkage maybe determined from a UL linkage through UL E-UTRA Absolute RadioFrequency Channel Number (EARFCN) of SIB2. For example, the DL-ULlinkage may be acquired through SIB2 decoding when initial access isperformed and may be acquired through RRC signaling otherwise.Accordingly, only the SIB2 linkage may be present and other DL-ULpairing may not be defined. For example, in the 5DL:1UL structure ofFIG. 28, DL CC #0 and UL CC #0 may be in an SIB2 linkage relation witheach other and other DL CCs may be in an SIB2 linkage relation withother UL CCs which have not been set for the UE.

CSI (for example, CQI, PMI, RI, or a combination thereof) transmitted onPUCCH will hereinafter be described in detail. CSI is periodicallytransmitted on PUCCH. That is, the subframe for PUCCH CSI may beperiodically configured. The periodic CSI has the limited number of bits(e.g., 11 bits) compared to aperiodic CSI feedback that is fed backthrough PUSCH. The periodic CSI may be transmitted through PUCCH formats2/2a/2b. In addition, CQI/PMI and RI are not transmitted on the samesubframe. The latest transmitted RI is used to calculate the widebandCQI/PMI.

The periodic CSI reporting procedure of the legacy LTE will hereinafterbe described with reference to FIGS. 30 and 31.

FIG. 30 exemplarily shows CSI reporting transmitted on PUCCH. Referringto FIG. 30, a user equipment (UE) periodically feeds back CQI, PMIand/or RI on PUCCH according to a PUCCH reporting mode. Information(e.g., period, offset, etc.) for periodically reporting the CSI issemi-statically configured.

-   -   Wideband feedback    -   Mode 1-0 description:        -   In the subframe where RI is reported (only for transmission            mode 3):            -   UE determines an RI assuming transmission on the set S                of subbands.            -   n.• The UE reports a PUCCH type 3 report consisting of                one RI.        -   In the subframe where CQI is reported:            -   UE reports a type 4 report consisting of one wideband                CQI value which is calculated assuming transmission on                the set S of subbands. The wideband CQI represents                channel quality for the first codeword even in the case                of RI>1.            -   For a transmission mode 3, the CQI is calculated on the                basis of the last reported periodic RI. For other                transmission modes, CQI is calculated on the basis of                Transmission Rank 1    -   Mode 1-1 description:        -   In the subframe where RI is reported (only for transmission            mode 4 and transmission mode 8):            -   The UE determines an RI assuming transmission on the set                S of subbands.            -   The UE reports a type 3 report consisting of one RI.        -   In the subframe where CQI/PMI is reported:            -   A single precoding matrix is selected from the codebook                subset assuming transmission on the set S of subbands.        -   UE reports a type 2 report on each successive reporting            opportunity consisting of the following items (1) to (3):            -   (1) A single wideband CQI value which is calculated                assuming the use of a single precoding matrix in all                subbands and transmission on the set S of subbands.            -   (2) The selected single precoding matrix indicator                (wideband PMI).            -   (3) When RI>1, a 3-bit wideband spatial differential                CQI, which is shown in Table 7.2-2.        -   For transmission mode 4 and transmission mode 8, the PMI and            CQI are calculated on the basis of the last reported            periodic RI. For other transmission modes, they are            calculated on the basis of transmission rank 1.    -   UE Selected subband feedback        -   Mode 2-0 description:            -   In the subframe where RI is reported (only for                transmission mode 3):                -   UE determines an RI assuming transmission on the set                    S of subbands.                -   The UE reports a type 3 report consisting of one RI.            -   In the subframe where wideband CQI is reported:                -   The UE shall report a type 4 report on each                    successive reporting opportunity consisting of one                    wideband CQI value which is calculated assuming                    transmission on the set S of subbands. The wideband                    CQI represents channel quality for the first                    codeword even in the case of RI>1.                -   For transmission mode 3, the CQI is calculated on                    the basis of the last reported periodic RI. For                    other transmission modes, the CQI is calculated on                    the basis of transmission rank 1.            -   In the subframe where CQI for the selected subbands is                reported:                -   The UE shall select the preferred subband within the                    set of N_(j) subbands in each of the J bandwidth                    parts where J is given in Table 14.                -   The UE shall report a PUCCH type 1 report consisting                    of one CQI value reflecting transmission only over                    the selected subband of a bandwidth part determined                    in the previous step along with the corresponding                    preferred subband L-bit label. PUCCH type 1 report                    for each bandwidth part will in turn be reported in                    respective successive reporting opportunities. The                    CQI represents channel quality for the first                    codeword even in the case of RI>1.            -   For transmission mode 3, the preferred subband selection                and CQI values are calculated on the basis of the last                reported periodic RI. For other transmission modes, CQI                is calculated on the basis of transmission rank 1.    -   Mode 2-1 description:        -   In the subframe where RI is reported (only for transmission            mode 4 and transmission mode 8):            -   UE shall determine an RI assuming transmission on the                set S of subbands.            -   The UE shall report a type 3 report consisting of one                RI.        -   In the subframe where wideband CQI/PMI is reported:            -   A single precoding matrix is selected from the codebook                subset assuming transmission on the set S of subbands.            -   UE shall report a PUCCH type 2 report on each respective                successive reporting opportunity consisting of:                -   A wideband CQI value which is calculated assuming                    the use of a single precoding matrix in all subbands                    and transmission on the set S of subbands.                -   The selected single precoding matrix indicator                    (wideband PMI).                -   When RI>1, and additional 3-bit wideband spatial                    differential CQI.            -   For transmission mode 4 and transmission mode 8, PMI and                CQI values are calculated on the basis of the last                reported periodic RI. For other transmission modes, PMI                and CQI are calculated conditioned on transmission rank                1.        -   In the subframe where CQI for the selected subbands is            reported:            -   The UE shall select the preferred subband within the set                of N_(j) subbands in each of J bandwidth parts where J                is given in Table 14.            -   The UE shall report a PUCCH type 1 report per bandwidth                part on each respective successive reporting opportunity                consisting of the following items (1) and (2):        -   (1) CQI value for codeword 0 reflecting transmission only            over the selected subband of a bandwidth part determined in            the previous step along with the corresponding preferred            subband L-bit label.        -   (2) When RI>1, an additional 3-bit subband spatial            differential CQI value for codeword 1 offset level.            -   Codeword 1 offset level=subband CQI index for codeword                0−subband CQI index for codeword 1.            -   It is assumed that the most recently reported single                precoding matrix in all subbands and transmission on the                set S of subbands are used.        -   For transmission mode 4 and transmission mode 8, the subband            selection and CQI values are calculated on the basis of the            last reported periodic wideband PMI and RI. For other            transmission modes, the subband selection and CQI values are            calculated on the basis of the last reported PMI and            transmission rank 1.

FIG. 31 exemplarily shows a method for periodically feeding back a CSIfor a UE-selected subband on PUCCH. The UE selects one subband for eachbandwidth part (BP) within the set S (or whole BW), and reports theselected subband only once at every CSI period. BP is composed of N_(J)CQI subbands, and the CQI subband is composed of k RBs.

FIG. 32 exemplarily shows the sizes of a bandwidth part (BP) and asubband when the UE selection scheme is used. Referring to FIG. 32, thesizes of BP and subband are dependent upon a system bandwidth N_(RB)^(DL). Meanwhile, if two codebooks are present, a wideband spatialdifferential CQI may be used for the second codeword. The widebandspatial differential CQI is obtained by subtracting the wideband CQI forcodeword 2 from the wideband CQI for codeword 1. The wideband spatialdifferential CQI represents an offset value for the wideband CQI forcodeword 1. The offset value may be information of 3 bits, and the setof offset values is denoted by {−4, −3, −2, −1, 0, 1, 2, 3}.

The following reporting modes are supported on PUCCH according totransmission modes. The transmission modes are semi-staticallyestablished by higher layer (e.g., RRC) signaling. Each of the followingreporting modes will hereinafter be referred to as Mode.

Transmission mode 1: Mode 1-0, Mode 2-0

Transmission mode 2: Mode 1-0, Mode 2-0

Transmission mode 3: Mode 1-0, Mode 2-0

Transmission mode 4: Mode 1-1, Mode 2-1

Transmission mode 5: Mode 1-1, Mode 2-1

Transmission mode 6: Mode 1-1, Mode 2-1

Transmission mode 7: Mode 1-0, Mode 2-0

Transmission mode 8: Mode 1-1, Mode 2-1 (if the UE configured withPMI/RI reporting); or Mode 1-0, Mode 2-0 (if the UE is configuredwithout PMI/RI reporting)

The periodic CQI reporting mode is given by the parametercqi-FormatIndicatorPeriodic which is configured by higher layersignaling.

For the UE-selected subband CQI, a CQI report in a certain subframedescribes a channel quality in a particular part or in particular partsof the bandwidth described subsequently as bandwidth part (BP) or parts.The bandwidth parts shall be indexed in the order of increasingfrequency and non-increasing sizes starting at the lowest frequency.

-   -   There are a total of N subsbands for a system bandwidth given by        N_(RB) ^(DL) where └N_(RB) ^(DL)/k┘ subbands are of size k. If        ┌N_(RB) ^(DL)/k┐−└N_(RB) ^(DL)/k┘>0, one of the subbands is of        size N_(RB) ^(DL)−k·└N_(RB) ^(DL)/k┘.    -   A bandwidth part j is frequency-consecutive and consists of        N_(j) subbands. The relationship among the subband size (k), the        bandwidth part (J), and the downlink system bandwidth is shown        in Table 14. If J=1, N_(j) is ┌N_(RB) ^(DL)/k/J┐. If J>1, N_(j)        is either ┌N_(RB) ^(DL)/k/J┐ or ┌N_(RB) ^(DL)/k/J┐−1, depending        on N_(RB) ^(DL), k and J.    -   Each bandwidth part j (where 0≤j≤J−1), is scanned in sequential        order according to increasing frequency.    -   For UE selected subband feedback, a single subband from among        N_(j) subbands of a bandwidth part is selected along with a        corresponding L-bit label indexed in the order of increasing        frequency, where L=┌log₂┌N_(RB) ^(DL)/k/J┐┐.

TABLE 14 System Bandwidth Subband Size k Bandwidth Parts N_(RB) ^(DL)(RBs) (J) 6-7 NA NA  8-10 4 1 11-26 4 2 27-63 6 3  64-110 8 4

Table 15 exemplarily shows a variety of CSI information, mode states,and PUCCH reporting modes according to PUCCH report types. The PUCCHreporting payload sizes are given according to PUCCH report types andmode states. The PUCCH report types are classified according to reportedCSI contents. The PUCCH report type may be referred to as anotherequivalent expression (for example, PUCCH format). If the PUCCH reporttype and periods/offsets of CQI/PMI/RI are given, the UE reports the CSIaccording to the PUCCH report type at a given subframe.

TABLE 15 PUCCH PUCCH Reporting Modes Report Mode 1-1 Mode 2-1 Mode 1-0Mode 2-0 Type Reported Mode State (bits/BP) (bits/BP) (bits/BP)(bits/BP) 1 Sub-band RI = 1 NA 4 + L NA 4 + L CQI RI > 1 NA 7 + L NA 4 +L 2 Wideband 2 TX Antennas RI = 1 6 6 NA NA CQI/PMI 4 TX Antennas RI = 18 8 NA NA 2 TX Antennas RI > 1 8 8 NA NA 4 TX Antennas RI > 1 11  11  NANA 3 RI 2-layer spatial multiplexing 1 1 1 1 4-layer spatialmultiplexing 2 2 2 2 4 Wideband RI = 1 or RI > 1 NA NA 4 4 CQI

As can be seen from Table 15, the following four PUCCH report types aresupported.

-   -   PUCCH report type 1 supports CQI feedback for the UE selected        sub-bands.    -   PUCCH report type 2 supports wideband CQI and PMI feedback.    -   PUCCH report type 3 supports RI feedback    -   PUCCH report type 4 supports wideband CQI

Periodicity N_(p) (in subframes) and offset N_(OFFSET,CQI) (insubframes) for CQI/PMI reporting are determined based on the parametercqi-pmi-ConfigIndex (I_(CQI/PMI)). Table 16 shows the mappingrelationship among I_(CQI/PMI), N_(p) and N_(OFFSET,CQI) for FDD, andTable 17 shows the mapping relationship among I_(CQI/PMI), N_(p) andN_(OFFSET,CQI) for TDD. Periodicity M_(RI) and relative offsetN_(OFFSET,RI) for RI reporting are determined based on the parameterri-ConfigIndex (I_(RI)) given in Table 18. Both cqi-pmi-ConfigIndex andri-ConfigIndex are configured by higher layer signaling. The relativereporting offset for RI N_(OFFSET,RI) takes one value from the set o {0,−1, . . . , −(N_(p)−1)}.

In the case where wideband CQI/PMI reporting is configured, thereporting instances for wideband CQI/PMI are considered to be subframescapable of satisfying (10×n_(ƒ)+└_(s)/2┘−N_(OFFSET,CQI)) mod N_(P)=0,and n_(ƒ) is a frame number and n_(s) is a slot number.

If RI reporting is configured, the reporting interval of the RIreporting is an integer multiple M_(RI) of period N_(p) (in subframes).The reporting instances for RI are considered to be subframes satisfying(10×n_(ƒ)+└n_(s)/2┘−N_(OFFSET,CQI)−N_(OFFSET,RI)) mod (N_(P)·M_(RI))=0.In case of collision of RI and wideband CQI/PMI, the wideband CQI/PMI isdropped.

In the case where both wideband CQI/PMI and subband CQI reporting areconfigured, the reporting instances for wideband CQI/PMI and subband CQIare considered to be subframes satisfying(10×n_(ƒ)+└n_(s)/2┘−N_(OFFSET,CQI)) mod N_(P)=0. The wideband CQI/PMIreport has period H·N_(P), and is reported on the subframes satisfying(10×n_(ƒ)+└n_(s)/2┘−N_(OFFSET,CQI)) mod (H·N_(P))=0. The integer H isdefined as H=J·K+1, where J is the number of bandwidth parts. Betweenevery two consecutive CQI/PMI reports, the remaining JK reportinginstances are used for CQI reports.

In case RI reporting is configured, the reporting interval of RI isM_(RI) times the wideband CQI/PMI period H·N_(P), and RI is reported onthe same PUCCH cyclic shift resources as those of both the widebandCQI/PMI and subband CQI reports. The reporting instances for RI areconsidered to be subframes satisfying(10×n_(ƒ)+└n_(s)/2┘−N_(OFFSET,CQI)−N_(OFFSET, RI)) mod(H·N_(P)·M_(RI))=0. In case of collision between RI and wideband CQI/PMI(or subband CQI), the wideband CQI/PMI (or subband) CQI is dropped.

The CQI/PMI or RI report shall be transmitted on the PUCCH resourcen_(PUCCH) ⁽²⁾ for PUCCH format 2. n_(PUCCH) ⁽²⁾ is UE-specific andconfigured by higher layers. In case of collision between CQI/PMI/RI andpositive SR in the same subframe, CRI/PMI/RI is dropped.

TABLE 16 I_(CQI/PMI) Value of N_(p) Value of N_(OFFSET,CQI) 0 ≤I_(CQI/PMI) ≤ 1 2 I_(CQI/PMI) 2 ≤ I_(CQI/PMI) ≤ 6 5 I_(CQI/PMI)-2  7 ≤I_(CQI/PMI) ≤ 16 10 I_(CQI/PMI)-7 17 ≤ I_(CQI/PMI) ≤ 36 20I_(CQI/PMI)-17 37 ≤ I_(CQI/PMI) ≤ 76 40 I_(CQI/PMI)-37  77 ≤ I_(CQI/PMI)≤ 156 80 I_(CQI/PMI)-77 157 ≤ I_(CQI/PMI) ≤ 316 160 I_(CQI/PMI)-157I_(CQI/PMI) = 317 Reserved 318 ≤ I_(CQI/PMI) ≤ 349 32 I_(CQI/PMI)-318350 ≤ I_(CQI/PMI) ≤ 413 64 I_(CQI/PMI)-350 414 ≤ I_(CQI/PMI) ≤ 541 128I_(CQI/PMI)-414  542 ≤ I_(CQI/PMI) ≤ 1023 Reserved

TABLE 17 I_(CQI/PMI) Value of N_(p) Value of N_(OFFSET,CQI) I_(CQI/PMI)= 0 1 I_(CQI/PMI) 1 ≤ I_(CQI/PMI) ≤ 5 5 I_(CQI/PMI)-1  6 ≤ I_(CQI/PMI) ≤15 10 I_(CQI/PMI)-6 16 ≤ I_(CQI/PMI) ≤ 35 20 I_(CQI/PMI)-16 36 ≤I_(CQI/PMI) ≤ 75 40 I_(CQI/PMI)-36 76 ≤ I_(CQI/PMI) ≤ 155 80I_(CQI/PMI)-76 156 ≤ I_(CQI/PMI) ≤ 315 160 I_(CQI/PMI)-156  316 ≤I_(CQI/PMI) ≤ 1023 Reserved

TABLE 18 I_(RI) Value of M_(RI) Value of N_(OFFSET,RI)  0 ≤ I_(RI) ≤ 1601 —I_(RI) 161 ≤ I_(RI) ≤ 321 2 —(I_(RI)-161) 322 ≤ I_(RI) ≤ 482 4—(I_(RI)-322) 483 ≤ I_(RI) ≤ 643 8 —(I_(RI)-483) 644 ≤ I_(RI) ≤ 804 16—(I_(RI)-644) 805 ≤ I_(RI) ≤ 965 32 —(I_(RI)-805)  966 ≤ I_(RI) ≤ 1023Reserved

For TDD periodic CQI/PMI reporting, the following periodicity values areused according to TDD UL/DL configurations.

-   -   The reporting period of N_(p)=1 is applicable only to TDD UL/DL        configurations 0, 1, 3, 4, and 6, where all UL subframes in a        radio frame are used for CQI/PMI reporting.    -   The reporting period of N_(p)=5 is applicable only to TDD UL/DL        configurations 0, 1, 2, and 6.    -   The reporting periods of N_(p)=(10,20,40,80,160) are applicable        to all TDD UL/DL configurations.

For N_(RB) ^(DL)≤7, Mode 2-0 and Mode 2-1 are not supported.

RI report in a periodic reporting mode is valid only for CQI/PMI reporton the corresponding periodic reporting mode.

The calculation of CQI/PMI is based on the last reported RI. In case ofthe absence of the last reported RI, the UE shall conduct the CQI/PMIcalculation conditioned on the lowest possible RI as given by the bitmapparameter codebookSubsetRestriction.

If a parameter ttiBundling provided by higher layers is set to TRUE andif an UL-SCH for use in the subframe bundling operation collides with aperiodic CQI/PMI/RI reporting instance, the UE shall drop the periodicCQI/PMI/RI report in the corresponding subframe and shall not multiplexperiodic CQI/PMI and/or RI during the PUSCH transmission in thecorresponding subframe.

In carrier aggregation (CA), collision may occur while each CSI(CQI/PMI/RI) of multiple DL CCs is fed back. For example, it is assumedthat periodic CSI feedbacks for individual DL CCs are independentlyconfigured. In this case, since PUCCH can be transmitted only in apredetermined UL PCell irrespective of a carrier aggregation (CA)situation, the UE may simultaneously feed back necessary information inthe same subframe according to CSI configurations. In this case, sincemultiple PUCCH resources are simultaneously transmitted in a singlesubframe, an undesirable situation may occur in consideration of IMD(Intermodulation distortion) or CM (Cubic Metric). The present inventionprovides a solution for overcoming the above-mentioned situation. Forconvenience of description and better understanding of the presentinvention, CC may be one of PCell (Primary Cell) or SCell (SecondaryCell). PCell may be a cell n which the UE performs initial access, andit is assumed that PCell may be reconfigured through subsequent RRCsignaling. PCell and SCell will hereinafter be referred to as a cell ora serving cell.

A method for solving collision of multiple CSI reports will hereinafterbe described. For convenience of description, it is assumed that aplurality of serving cells is configured. In addition, it is assumedthat periodic CSI feedback for each serving cell is independentlyconfigured for each cell. The present invention proposes a method forperforming only one CSI reporting within one subframe on the assumptionof the above-mentioned description. The subframe for CSI reporting isgiven by a period and offset according to CSI configuration. For eachserving cell, a period and an offset for CQI/PMI may be given, and aperiod and an offset for RI may be independently given.

In more detail, if CSI reporting events of multiple serving cells aregenerated in a given subframe (that is, if CSIs of multiple servingcells collide with each other), the present invention proposes a methodfor performing only CSI reporting of a specific serving cell. For thispurpose, transmission of the remaining CSI reporting other than only onespecific CSI reporting from among a plurality of colliding CSI reportsmay be dropped. A method (or condition) for selecting only one specificCSI reporting will hereinafter be described in detail. For convenienceof description, although individual methods (or conditions) aredisclosed separately from each other, it should be noted that they maybe combined with each other or the application order of individualmethods (or conditions) may be defined in various ways.

First Method (or First Condition)

If CSI reports of multiple serving cells collide with each other withina given subframe, CSI reporting of the corresponding serving cell may bedropped according to priority of the CSI reporting. The priority of CSIreporting may be determined according to priority of target CSIinformation to be transmitted. Although the scope or spirit of thepresent invention is not limited thereto, priority of CSI informationmay be determined to be RI>PMI=CQI. For example, if CQI and/or PMItransmission for DL SCell#0 and RI transmission for DL SCell#1 occur inthe same subframe, CQI and/or PMI transmission having relatively lowpriority may be omitted (or dropped). Alternatively, a wideband (WB) CQIfeedback may have higher priority than a subband (SB) CQI feedback. Thatis, if SB feedback for DL PCell and WB feedback for DL SCell#2 aregenerated in the same subframe, CSI reporting for DL SCell#2 isperformed and CSI reporting for DL PCell may be dropped.

As can be seen from Table 15, CSI reporting of the serving cell isdefined using PUCCH report types. Therefore, on the assumption ofRI>PMI=CQI, priorities of PUCCH report types may be denoted by “PUCCHreport type 2>PUCCH report type 1=3=4”. In accordance with theabove-mentioned example, CSI reporting for DL SCell#0 may be PUCCHreport type 1, 3 or 4, and CSI reporting for DL SCell#1 may be PUCCHreport type 2. Therefore, CSI reporting for DL SCell#0 having a lowerpriority is dropped.

In accordance with the first method, CSI reporting of multiple servingcells may have the same priority. Accordingly, in the case of using thefirst condition, if priorities of PUCCH report types cause collision ofCSI reports among the same serving cells, an additional condition forselecting only one specific CSI reporting is needed. In this case, CSIreports (i.e., CSI reports of other serving cells) other than only onespecific CSI report (i.e., CSI report of a specific serving cell) aredropped.

Second Method (or Second Condition)

Priority is assigned to each DL Cell (or CC) so that it is determinedwhether CSI reporting is dropped. For example, higher priority may beassigned to feedback for DL PCell. In more detail, if CQI, PMI or RItransmission events for DL PCell, and CQI, PMI or RI transmission eventsfor DL SCell#1 and SCell#2 occur in the same subframe, only CSI reportfor PCell having a relatively high priority may be transmitted, and CSIreports for SCell#1 and SCell#2 may be dropped. CSI report of SCell maybe dropped according to cell priority. If CSI report for PCell is nottransmitted, CSI report may be transmitted on PUCCH according to thepriority relationship predetermined among SCells. For example, priorityis assigned to CSI reporting of the serving cell having the lowest (orthe highest) physical/logical indexes, so that only feedback of thecorresponding serving cell can be transmitted. That is, if feedback ofSCell#1 collides with feedback of SCell#2, only the feedback of SCell#1having the lowest index may be transmitted and the feedback of SCell#2may be dropped.

On the other hand, SCell is additionally configured after PCell has beenconfigured, so that (logical) index of PCell has the lowest value and(logical) index of at least one SCell may have a subsequent value.proposed condition may be generalized as: if CSI reports of multipleserving cells collide with each other in a given subframe, only CSIreport of the serving cell having the lowest index may be performed andCSI reports of other serving cells may be dropped, without distinctionbetween PCell and SCell. In contrast, a specific case in which a(logical) index of PCell has the highest value may be considered. Inthis case, the proposed condition may be generalized as: if CSI reportsof multiple serving cells collide with each other within a given servingcell, only CSI report of the serving cell having the highest index maybe performed and CSI reports of other serving cells may be dropped,without distinction between PCell and SCell.

In another example, after CSI priority of a cell domain is configured inthe network, CSI priority (or cell priority from the viewpoint of CSIreporting) may be signaled to the UE through RRC signaling. For example,the priority information of DL PCell>SCell#2>SCell#1>SCell#0 is signaledfrom the BS to the UE, and the UE may drop CSI reports other than oneCSI report according to such priority information. The priorityinformation may be associated with a Quality of Service (QoS) that maybe configured in different ways according to individual DL Cells. Forexample, DL Cell having a relatively high QoS may perform CSI reportinghaving a higher priority. QoS may be signaled to each cell from thenetwork to the UE.

In another example, priority of CQI reporting may be configuredaccording to a drop count. For example, assuming that the number of CSIreport drop times of DL SCell#1 is ‘a’ and the number of CSI report droptimes of DL SCell#2 is ‘b’, CSI report for DL SCell having a higher (orsmaller) number of drop times between ‘a’ and ‘b’ times may be dropped.

In another example, priority may be assigned to CSI report of DL Cellhaving a short transmission period (i.e., a high number of transmissionfrequencies) on the condition that CSI report is configured for eachcell. If the CSI report has a short transmission period, the network mayassign a higher priority to the corresponding DL Cell, so that CSIreport of the corresponding DL Cell may have a higher priority. Incontrast, priority may be assigned to CSI report of DL Cell having along transmission period (i.e., a low transmission frequency) under thecondition that CSI reporting is configured per cell. The longtransmission period means that there is a low possibility of feedingback the CSI report, so that the number of feedback opportunities may belost when CSI reporting of the corresponding cell is dropped.Accordingly, priority may be assigned to the CSI reporting having DLCell having a long transmission period.

In another example, priority of the serving cell may be configuredaccording to scheduling types (e.g., self-scheduling, cross-scheduling,etc.) from the viewpoint of CSI reporting. For example, from theviewpoint of CSI reporting, priority of the self-scheduling cell (e.g.,self-scheduling PCell or self-scheduling SCell) may be higher thanpriority of cross-scheduling cell (e.g., cross-scheduling SCell).Therefore, if CSI reports of multiple serving cells collide with eachother within a given subframe, priority may be assigned to CSI reportingof the self-scheduling cell and CSI reporting of the cross-schedulingcell may be dropped. In contrast, priority of the cross-scheduling cell(e.g., cross-scheduling PCell) may be higher than priority of theself-scheduling cell (e.g., self-scheduling PCell or self-schedulingSCell). Accordingly, if CSI reports of multiple serving cells collidewith each other within a given subframe, priority may be assigned to CSIreporting of the cross-scheduling cell, and CSI reporting of theself-scheduling cell may be dropped.

The above-mentioned cell priority method may be applied to all thecolliding CSI reports, or may also be applied to some CSI reports fromamong all the CSI reports. For example, the above-mentioned cellpriority method may be applied only to CSI reports of different servingcells having the same priority. In this case, another method (e.g., thefirst method) may be applied to CSI reports of different serving cellshaving different priorities.

In the meantime, if multiple CSI report events occur in the samesubframe, multiple CSI reports can be joint-coded. For example, when CSIreport for DL PCell and CSI report for DL SCell#1 should be transmittedin the same subframe, CSI information for two serving cells may bejoint-coded and transmitted. Such joint coding may be carried out usingReed-Muller (RM) coding. If a total size of information bits to bejoint-coded exceeds 11 or 13 bits capable of being accommodated in PUCCHformat 2, MSM (Multi Sequence Modulation) based PUCCH format orDFT-S-OFDM based PUCCH format (See FIG. 29) may be transmitted. In thiscase, since a front part of information bit streams has higherreliability due to RM coding characteristics, CSI information for DLPCell (or DL Cell having high priority) may be located at the frontpart.

In addition, it is undesirable that RI having relatively high priorityfrom among CSI information is dropped, so that the drop rule is appliedto CQI/PMI and the RI may be specially joint-coded. Since RI is composedof a maximum of 2 bits per DL serving cell, a total of 10 bits must bejoint-coded with 5 DL serving cells, so that this size can beaccommodated in PUCCH format 2. In this case, since a front part ofinformation bit streams has higher reliability due to RM codingcharacteristics, CSI information for DL PCell (or DL Cell having highpriority) may be located at the front part.

Alternatively, WB CQI feedback may have a higher priority than SB CQIfeedback. That is, if SB feedback for DL PCell and WB feedback for DLSCell#2 are generated in the same subrame, CSI report for DL SCell#2 maybe carried out and CSI report for DL PCell may be dropped.

The above-mentioned priority configuration methods may be usedindependently or in combination. For example, priority dependent uponUCI (e.g., RI) and cell priority concept (e.g., PCell priority) can besimultaneously used. In more detail, RI of PCell may be assigned thehighest priority, and RIs of SCells may be assigned the next priority.One or more SCells may follow priorities of SCells which are configuredby RRC signaling or QoS, etc. Then, CQI/PMI of PCell may have the nextpriority, and CQI/PMI of SCells may have the next subsequent priority.As can be seen from Table 15, CSI report configuration of the servingcell is defined using PUCCH report types. Therefore, the above-mentionedcontents can be summarized.

If CSI reports of multiple serving cells collide with each other withinone subframe, CSI reporting of the serving cell including a PUCCH reporttype having a lower priority is dropped. If multiple serving cellshaving the same-priority PUCCH report types are present, CSI report ofthe serving cell having the lowest cell index (or CC) is transmitted,and CSI reports of the remaining serving cells are dropped.

FIG. 33 is a flowchart illustrating a method for performing CSI reportaccording to the embodiments of the present invention. In FIG. 33, it isassumed that three DL cells are configured. Three cells may indicate allcells configured for the corresponding UE or may also indicate only someactivated cells from among the configured cells. The configured cell mayinclude DL PCell and one or more DL SCells, and the configured cell, DLPCell and DL SCells will hereinafter be generically named a servingcell.

Referring to FIG. 33, the UE and the network node (e.g., BS or RN) mayestablish periodic CSI reporting configuration for each serving cell instep S3302. For this operation, the network node transmits configurationinformation for CSI reporting to the UE. The CSI reporting configurationinformation may include a variety of configuration information (e.g.,PUCCH report type, period, offset, band size, etc.) disclosed in FIGS.30 to 32. A method for performing the step S3302 will be described laterwith reference to a second embodiment to be described. Afterconfiguration information for periodic CSI reporting is established, theUE may perform a PUCCH resource allocation procedure to carry out CSIreports of PUCCH report types/modes in the corresponding subframeaccording to CSI report configuration (step S3304). In more detail, theUE determines whether CSI reporting is performed in the correspondingsubframe according to a CSI reporting period and an offset configuredper serving cell, and determines whether PUCCH resources are allocatedaccording to the determined result. PUCCH resource may include PUCCHformats 2/2a/2b.

Meanwhile, the aforementioned example assumes that a plurality of CSIreports (i.e., CSI reports of multiple serving cells) may collide witheach other in the same subframe. Each CSI reporting may correspond toCSI reporting for the corresponding DL Cell. In this case, the UEtransmits CSI reporting of only one serving cell over PUCCH, and dropsCSI reporting of the remaining serving cells. Dropping of the CSIreporting may be achieved in step S3304 (i.e., a channel resourceallocation process), or may be achieved before or after the step S3304as necessary.

For convenience of description, it is assumed that CSI reports of threecells collide with each other in the same subframe, and PUCCH reporttypes (See Table 18) of individual cells are configured as follows.

Case 1:

-   -   DL Cell #1 (i.e., Serving Cell #1): PUCCH Report Type 1    -   DL Cell #2 (i.e., Serving Cell #2): PUCCH Report Type 2    -   DL Cell #3 (i.e., Serving Cell #3): PUCCH Report Type 3

Referring to Table 18, PUCCH report types 1 and 2 are used for reportinga CQI, and PUCCH report type 3 is used for reporting an RI.

→ In accordance with the first method, since RI has a higher prioritythan CQI, CSI report of DL Cell #3 is transmitted and CSI reports of DLCells #1 and #2 may be dropped.

→ In accordance with the second method, only CSI reporting of theserving cell having the lowest index can be transmitted. That is, CSIreport of DL Cell #1 may be transmitted and CSI reports of DL Cells #2and #3 may be dropped.

Case 2:

-   -   DL Cell #1 (i.e., serving cell #1): PUCCH Report Type 1    -   DL Cell #2 (i.e., serving cell #2): PUCCH Report Type 2    -   DL Cell #3 (i.e., serving cell #3): PUCCH Report Type 4

Referring to Table 18, PUCCH report type 1 is used to transmit a subband(SB) CQI, PUCCH report type 2 is used to transmit a wideband (WB)CQI/PMI, and PUCCH report type 4 is used to transmit a WB CQI.

→ In accordance with the first method, PUCCH report types 1, 2 and 4 areused for CQI reporting. In accordance with the implementation example,priorities of PUCCH report types 1, 2 and 4 may have the followingrelationship: (i) PUCCH report type 1=PUCCH report type 2=PUCCH reporttype 4; and (ii) PUCCH report type 1 PUCCH report type 2=PUCCH reporttype 4, and PUCCH report type 1 PUCCH report type 2 PUCCH report type 4.In the cases of (i) and (ii), multiple PUCCH report types have the samepriority, such that an additional method for transmitting only CSIreporting of a single serving cell is needed.

→ In accordance with the second method, only CSI reporting of theserving cell having the lowest index may be transmitted as an example.That is, CSI report of DL Cell #1 may be transmitted and CSI reports ofDL Cells #2 and #3 may be dropped.

The first method and the second method may be combined with each other.For example, after the first method is used, the second method can beapplied. For convenience of description, it is assumed that the case of(ii) is used in the above-mentioned example. In this case, the followingCSI reporting transmission rule can be applied as follows.

TABLE 19 PUCCH report Application of Application of Cell index typePriority First Method Second Method Cell #1 1 2 Drop — Cell #2 2 1Non-drop Non-drop Cell #3 4 1 Non-drop Drop

Priority 1 may be higher than Priority 2.

Provided that the second method is applied to CSI reports of differentserving cells having the same priority, the first method has noconnection with the second method. If the first method is used aftercompletion of the second method, the following result can be obtained asshown in Table 20.

TABLE 20 PUCCH Report Application of Application of Cell index TypePriority Second Method First Method Cell #1 1 2 Non-drop Drop Cell #2 21 Non-drop Non-drop Cell #3 4 1 Drop —

Embodiment 2: Signaling for Configuring CSI Reporting

As described above, since periodic CSI reporting is transmitted overPUCCH, the periodic CSI reporting can always be transmitted through ULPCell irrespective of carrier aggregation (CA). In this case, it isassumed that periodic CSI reporting for each DL Cell (or DL CC) isindependently configured. For this purpose, configuration informationneeded for CSI reporting of each serving cell may be transmitted throughthe corresponding DL Cell (or DL CC), or may be transmitted throughPCell (or PCC), or may be transmitted through an arbitrary DL Cell (orDL CC).

Signaling contained in configuration information may be changedaccording to which DL Cell is used for transmission of periodic CSIreport configuration information. Signaling methods for individualsituations will hereinafter be described in detail.

1) In case that CSI report configuration information of thecorresponding DL Cell is transmitted in each DL Cell (or DL CC):

Provided that the UE recognizes BW information of UL PCell, CSIreporting can be configured through higher layer signaling received from3GPP LTE without any other signaling. In this case, the UE can performCSI reporting without generating ambiguity through the corresponding CSIreporting configuration information. In accordance with the configuredand activated SCell(s), CSI configuration information may be transferredto the configured and activated SCells through higher layer signaling ofthe corresponding SCell(s)

2) In case that CSI feedback configuration information of one or more DLCells (or DL CCs) is transmitted in PCell (or PCC):

When PUCCH CSI feedback of each DL Cell (or DL CC) is configured in PCC,DL CC index [physical index, logical index or 3-bit CIF (CarrierIndication Field)] can also be notified in such a manner that thecorresponding configuration can recognize which DL cell (or DL CC) isassociated with the corresponding configuration. After the UE receivesconfiguration information transmitted through higher layer signaling, itis determined which DL Cell (or DL CC) is associated with thecorresponding configuration and can transmit PUCCH CSI feedback suitablefor the determined configuration.

If PUCCH CSI feedback configurations of all DL CCs are transmitted in DLPCC without using DL CC index, the UE may have ambiguity in recognizingwhich DL CC is associated with the transmitted configuration.

If PUCCH CSI reporting configuration information of all DL CCs istransmitted in DL PCell without using DL Cell (or DL CC) index, the UEmay have ambiguity in recognizing which DL Cell (or DL CC) is associatedwith the received CSI reporting configuration information. DL PCell andDL SCells may have different bandwidths (BWs), so that there may occurambiguity in SB size k (Subband size k) or BP (Bandwidth Parts J)changeable with BW in consideration of only CSI reporting configurationinformation having no DL Cell (or DL CC) index. In order to solve suchambiguity, DL Cell (or DL CC) index may be transmitted along with CSIconfiguration information.

In addition, CSI reporting may be required not only for ‘configured andactivated SCells’ but also for ‘configured but deactivated SCells’.Accordingly, there is needed CSI feedback configuration information fordeactivated SCells. The UE does not perform monitoring of thedeactivated SCells, so that it cannot transmit CSI report configurationinformation through the corresponding SCell(s). Therefore, CSIconfiguration information of the deactivated SCell may be transmittedalong with a cell (or CC) index via higher layer signaling on PCell.

In PCell, it may be possible to indicate CSI report configurationinformation of all DL Cells including PCell, and it may also be possibleto indicate CSI report configuration information of PCell anddeactivated SCells. In the latter case, CSI report configurationinformation of the activated SCell may be transmitted through thecorresponding SCell.

When CSI report configuration information of all DL cells is transmittedin PCell, CSI configuration information for PCell may use 3GPP LTEmethods without any change, and CSI configuration information of theremaining SCells may be transmitted in the form of delta (i.e., adifference value or offset) of PCell information.

3) In case that in which CSI reporting configuration information of oneor more DL CCs (DL Cells) is transmitted in an arbitrary DL Cell (DLCC):

In this case, CSI configuration information element (IE) may be assignedto DL Cell (or DL CC) configuration IE. In other words, a CSI feedbackconfiguration message can be transmitted in an arbitrary DL Cellirrespective of DL PCell and SCell. In this case, an arbitrary DL Cellmay be composed of one or more DL Cells. Similarly to the second method(2), DL Cell (or DL CC) index is contained in the CSI configuration IE,so that it can be recognized which DL Cell includes DL CC configurationinformation and CSI configuration information using the DL CC index.

When CSI report configuration information of one or more DL cells istransmitted using an arbitrary DL Cell, CSI configuration information ofthe PCell or CSI configuration information of the self-scheduling CC mayuse 3GPP LTE method without any change, and configuration information ofthe remaining DL cell(s) may be transmitted in the form of delta.

FIG. 34 is a block diagram illustrating a base station (BS) and a userequipment (UE) applicable to embodiments of the present invention. If arelay or a relay node (RN) is contained in a wireless communicationsystem, communication of a backhaul link is achieved between the BS andthe RN, and communication of an access link is achieved between the RNand the UE. Therefore, the term ‘BS’ or ‘UE’ may be replaced with arelay or a relay node (RN) according to a situation.

Referring to FIG. 34, the wireless communication system includes a basestation (BS) 110 and a UE 120. The BS 110 includes a processor 112, amemory 114, and a radio frequency (RF) unit 116. The processor 112 maybe constructed to implement the procedures and/or methods disclosed inthe embodiments of the present invention. The memory 114 may beconnected to a processor 112, and store various information related tooperations of the processor 112. The RF unit 116 is connected to theprocessor 112, and transmits and/or receives RF signals. The UE 120includes a processor 122, a memory 124, and an RF unit 126. Theprocessor 122 may be constructed to implement the procedures and/ormethods disclosed in the embodiments of the present invention. Thememory 124 may be connected to a processor 122, and store variousinformation related to operations of the processor 122. The RF unit 126is connected to the processor 122, and transmits and/or receives RFsignals. The BS 110 and/or the UE 120 may include a single antenna ormultiple antennas.

The aforementioned embodiments are achieved by combination of structuralelements and features of the present invention in a predeterminedfashion. Each of the structural elements or features should beconsidered selectively unless specified otherwise. Each of thestructural elements or features may be carried out without beingcombined with other structural elements or features. Also, somestructural elements and/or features may be combined with one another toconstitute the embodiments of the present invention. The order ofoperations described in the embodiments of the present invention may bechanged. Some structural elements or features of one embodiment may beincluded in another embodiment, or may be replaced with correspondingstructural elements or features of another embodiment. Moreover, it willbe apparent that some claims referring to specific claims may becombined with other claims referring to claims other than the specificclaims to constitute the embodiment or add new claims by means ofamendment after the application is filed.

The embodiments of the present invention have been described based ondata transmission and reception between a BS (or eNB) and a UE. Aspecific operation which has been described as being performed by theeNB (or BS) may be performed by an upper node of the eNB (or BS) as thecase may be. In other words, it will be apparent that various operationsperformed for communication with the UE in the network which includes aplurality of network nodes along with the eNB (or BS) can be performedby the BS or network nodes other than the eNB (or BS). The term eNB (orBS) may be replaced with terms such as fixed station, Node B, eNode B(eNB), and access point. Also, the term UE may be replaced with termssuch as mobile station (MS) and mobile subscriber station (MSS).

The embodiments according to the present invention can be implemented byvarious means, for example, hardware, firmware, software, orcombinations thereof. If the embodiment according to the presentinvention is implemented by hardware, the embodiment of the presentinvention can be implemented by one or more application specificintegrated circuits (ASICs), digital signal processors (DSPs), digitalsignal processing devices (DSPDs), programmable logic devices (PLDs),field programmable gate arrays (FPGAs), processors, controllers,microcontrollers, microprocessors, etc.

If the embodiment according to the present invention is implemented byfirmware or software, the embodiment of the present invention may beimplemented by a module, a procedure, or a function, which performsfunctions or operations as described above. Software code may be storedin a memory unit and then may be driven by a processor. The memory unitmay be located inside or outside the processor to transmit and receivedata to and from the processor through various well known means.

It will be apparent to those skilled in the art that the presentinvention can be embodied in other specific forms without departing fromthe spirit and essential characteristics of the invention. Thus, theabove embodiments are to be considered in all respects as illustrativeand not restrictive. The scope of the invention should be determined byreasonable interpretation of the appended claims and all changes whichcome within the equivalent scope of the invention are within the scopeof the invention.

Industrial Applicability

Exemplary embodiments of the present invention can be applied to a userequipment (UE), a base station (BS), and other devices. In more detail,the present invention can be applied to a method and apparatus fortransmitting uplink control information.

1-12. (canceled)
 13. A method for transmitting a periodic channel stateinformation (CSI) report by a user equipment (UE) in a wirelesscommunication system, the method comprising: receiving configurationinformation on periodic CSI reports for a primary cell (PCell) and atleast one secondary cell (SCell); and transmitting a periodic CSI reportwith a wideband (WB) channel quality indicator (CQI) in a subframeaccording to the configuration information, based on whether a periodicCSI report with a subband (SB) CQI and the periodic CSI report with theWB CQI are collided in the subframe, wherein the periodic CSI reportwith the SB CQI is dropped by the UE based on whether the periodic CSIreport with the SB CQI and the periodic CSI report with the WB CQI arecollided in the subframe.
 14. The method of claim 13, when the periodicCSI report with the SB CQI and the periodic CSI report with the WB CQIare collided in the subframe, wherein the periodic CSI report with theWB CQI has higher priority than the periodic CSI report with the SB CQI,wherein the SB CQI is obtained from the PCell, and wherein the WB CQI isobtained from an SCell.
 15. The method of claim 13, when a periodic CSIreport with a rank indicator (RI) and either the periodic CSI reportwith the SB CQI or the WB CQI are collided in the subframe, wherein theperiodic CSI report with the SB CQI or the WB CQI has lower priority andis dropped by the UE.
 16. The method of claim 15, further comprising:transmitting the periodic CSI report with the RI, and the periodic CSIreport with the RI has higher priority over the periodic CSI report withthe SB CQI or the WB CSI, wherein the WB CQI or the SB CQI is obtainedfrom the PCell, and wherein the RI is obtained from an SCell.
 17. Themethod of claim 13, when a periodic CSI report with a rank indicator(RI) of the PCell and a periodic CSI report with an RI of an SCell arecollided in the subframe, wherein the periodic CSI report with the RI ofthe SCell has lower priority and is dropped by the UE.
 18. The method ofclaim 17, further comprising: when the periodic CSI report with the RIof the SCell and a periodic CSI report with an RI of another SCell arecollided in the subframe, transmitting according to cell indices of theSCell and the another SCell.
 19. The method of claim 18, wherein a CSIreport including an RI of a higher indexed SCell among the SCell and theanother SCell is dropped by the UE.
 20. The method of claim 13, whereinthe configuration information comprises information on a reportingperiod of each of the periodic CSI reports.
 21. A non-transitorycomputer readable medium recorded thereon a program for executing themethod of claim
 13. 22. A user equipment (UE) for transmitting periodicchannel state information (CSI) report in a wireless communicationsystem, the UE comprising: a transceiver; and a processor, operativelycoupled to the transceiver, wherein the processor is configured to:control the transceiver to receive configuration information on periodicCSI reports for a primary cell (PCell) and at least one secondary cell(SCell), and control the transceiver to transmit a periodic CSI reportwith a wideband (WB) channel quality indicator (CQI) in a subframeaccording to the configuration information, based on whether a periodicCSI report with a subband (SB) CQI and the periodic CSI report with theWB CQI are collided in the subframe, wherein the periodic CSI reportwith the SB CQI is dropped by the processor based on whether theperiodic CSI report with the SB CQI and the periodic CSI report with theWB CQI are collided in the subframe.
 23. The UE of claim 22, when theperiodic CSI report with the SB CQI and the periodic CSI report with theWB CQI are collided in the subframe, wherein the periodic CSI reportwith the WB CQI has higher priority than the periodic CSI report withthe SB CQI, wherein the SB CQI is obtained from the PCell, and whereinthe WB CQI is obtained from an SCell.
 24. The UE of claim 22, when aperiodic CSI report with a rank indicator (RI) and either the periodicCSI report with the SB CQI or the WB CQI are collided in the subframe,wherein the periodic CSI report with the SB CQI or the WB CQI has lowerpriority and is dropped by the processor.
 25. The UE of claim 24,wherein the processor further configured to: control the transceiver totransmit the periodic CSI report with the RI, and the periodic CSIreport with the RI has higher priority over the periodic CSI report withthe SB CQI or the WB CSI, wherein the WB CQI or the SB CQI is obtainedfrom the PCell, and wherein the RI is obtained from an SCell.
 26. The UEof claim 22, when a periodic CSI report with a rank indicator (RI) ofthe PCell and a periodic CSI report with an RI of an SCell are collidedin the subframe, wherein the periodic CSI report with the RI of theSCell has lower priority and is dropped by the processor.
 27. The UE ofclaim 26, wherein the processor further configured to: control thetransceiver to transmit according to cell indices of the SCell and theanother SCell when the periodic CSI report with the RI of the SCell anda periodic CSI report with an RI of another SCell are collided in thesubframe.
 28. The UE of claim 27, wherein a CSI report including an RIof a higher indexed SCell among the SCell and the another SCell isdropped by the processor.
 29. The UE of claim 22, wherein theconfiguration information comprises information on a reporting period ofeach of the periodic CSI reports.